M1919 Browning machine gun

TheM1919 Browningis a.30 calibermedium machine gunthat was widely used during the 20th century, especially duringWorld War II,theKorean War,and theVietnam War.The M1919 saw service as a lightinfantry,coaxial,mounted,aircraft,andanti-aircraftmachine gun by the U.S and many other countries.

Machine Gun, Caliber.30, Browning, M1919
M1919A4 on tripod
Type	Medium machine gun
Place of origin	United States
Service history
In service	1919–present
Used by	SeeUsers
Wars	World War II Chinese Civil War Korean War First Indochina War Indonesian National Revolution 1958 Lebanon crisis Cuban Revolution Algerian War Second Taiwan Strait Crisis Greek Civil War Vietnam War Laotian Civil War Bay of Pigs Invasion Cambodian Civil War Portuguese Colonial War Lebanese Civil War Rhodesian Bush War 1982 Lebanon War South African Border War Iran–Iraq War Iraq War Mexican Drug War Militias–Comando Vermelho conflict (2010–present)
Production history
Designer	John M. Browning
Designed	1919
Manufacturer	Buffalo Arms Corporation Rock Island Arsenal Saginaw Steering Geardivision ofGeneral Motors
Produced	1919–1945
No.built	438,971
Variants	A1; A2; A3; A4; A5; A6; M37; AN/M2
Specifications
Mass	31 lb (14 kg) (M1919A4)
Length	37.94 in (964 mm) (M1919A4) 53 in (1,346 mm) (M1919A6)
Barrellength	24 in (610 mm)
Cartridge	.30-06 Springfield 7.62×51mm NATO .303 British 7.92×57mm Mauser 6.5×55mm 7.62×54mmR 8×63mm patron m/32 7.65×53mm Argentine 7.5×54mm French
Action	Recoil-operated/short-recoiloperation,closed bolt
Rate of fire	400–600 rounds/min (1200–1500 rounds/min for AN/M2 variant)
Muzzle velocity	2,800 ft/s (853 m/s)
Effective firing range	1,500 yd (1,400 m)
Maximum firing range	1,500 m (1,600 yd)
Feed system	250-round cloth or disintegratingbelt

The M1919 was an air-cooled development of the standard US machine gun ofWorld War I,theJohn M. Browning-designed water-cooledM1917.The emergence ofgeneral-purpose machine gunsin the 1950s pushed the M1919 into secondary roles in many cases, especially after the arrival of theM60inUS Armyservice. TheUnited States Navyalso converted many to7.62 mm NATOand designated them Mk 21 Mod 0; they were commonly used on riverine craft in the 1960s and 1970s in Vietnam. ManyNATOcountries also converted their examples to 7.62 mm caliber, and these remained in service well into the 1990s, as well as up to the present day in some countries.

Operation

Loading

The M1919 originally fired the.30 cal M1906 (.30-06)ballcartridge,and later the.30 caliber M2 ball cartridge, contained in a woven clothbelt,feeding from left to right. A metalM1 linkwas later adopted, forming a"disintegrating" belt.

Loading was accomplished by inserting the pull tab on the ammunition belt from the left side of the gun—either metal links or metal tab on cloth belts—until the feeding pawl at the entrance of the feed way engaged the first round in the belt and held it in place. The cocking handle was then pulled back with the right hand, palm facing up (to protect the thumb from injury if the weapon fired unexpectedly, which could happen if the barrel was very hot), and then released. This advanced the first round of the belt in front of the bolt for the extractor/ejector on the bolt to grab the first cartridge. The cocking handle was then pulled and released a second time. This caused the extractor to remove the first cartridge from the belt and chamber it (load it into the barrel ready to fire). As the bolt slid forward into battery, the extractor engaged the next round on the now-advanced belt resting in the feedway, preparing to draw it from the belt in the next firing cycle.

Every time the gun fired a shot, it performed this sequence: the bolt came rearward, extracting the spent round from the chamber and pulling the next round from the belt so that the fresh round ejected the spent one. As the bolt came forward, it chambered the fresh round, advanced the belt, and engaged the following round in preparation for loading. Once the bolt closed, the firing pin dropped, and the round was fired.

The sequence was repeated roughly ten cycles per second until the trigger was released or the ammunition belt was exhausted.

US soldiers fire a M1919A4 during theBattle of Aachen,October 1944

The gun's original design was as a water-cooled machine gun (see theM1917 Browning machine gun). When it was decided to try to lighten the gun and make it air-cooled, its design as aclosed boltweapon created a potentially dangerous situation. If the gun was very hot from prolonged firing, the cartridge ready to be fired could be resting in a red-hot barrel, causing the propellant in the cartridge to heat up to the point that it would ignite and fire the cartridge on its own (acook-off). With each further shot heating the barrel even more, the gun would continue to fire uncontrollably until the ammunition ran out, since depressing the trigger was not what was causing the gun to fire (although rarely as full rate automatic fire; it takes time for heat to soak into a cartridge, so usually it would manifest as a series of unexpected random discharges, the frequency increasing with the temperature of the barrel). Gunners were taught to cock the gun with the palm facing up, so that in the event of a cook-off, their thumb would not be dislocated by the charging handle, and to seize the ammunition belt and pull to prevent it from feeding, if the gun ever started an uncontrollable cycle of cooking off. Gunners were trained to manage the barrel heat by firing in controlled bursts of three to five rounds, to delay heating. Most other air-cooled machine gun designs were fired in the same way, even those featuring quick-change barrels, and which fired from anopen bolt,two features that make air-cooled machine guns capable of somewhat more sustained fire, both features that the M1919 design lacked.

Firing

When the gun was ready to fire, a round would be in the chamber and the bolt and barrel group would be locked together, with the locking block at the rear of the bolt. When the rear of the trigger was pivoted upwards by the operator, the front of the trigger tipped downward, pulling the sear out of engagement with the spring-loaded firing pin, allowing it to move forward and strike the primer of the cartridge.

As the assembly of bolt, barrel and barrel extensionrecoiled to the rear of the gun upon firing,the locking block was drawn out of engagement by a cam in the bottom of the gun's receiver. The recoiling barrel extension struck the "accelerator" assembly, a half-moon shaped spring-loaded piece of metal pivoting from the receiver below the bolt and behind the barrel extension. The tips of the accelerator's two curving fingers engaged the bottom of the bolt and caused it to move rapidly to the rear. The extractor-ejector was a mechanism that pivoted over the front of the bolt, with a claw that gripped the base of the next round in the belt. A camming track in the left side of the receiver caused this to move down as the bolt moved back, lowering the next round down on top of the fired case, pushing it straight down out of the extraction grooves of the bolt face through the ejection port. A spring in the feed tray cover pushed the extractor-ejector down onto the next round, so if the feed tray cover was opened, the extractor-ejector would be pulled upwards if the belt needed to be removed.

M1 tripod with canvas cover

The belt feed lever was connected to the belt feeding pawl at the front end, had a cam pin at the rear end which ran through a track in the top of the bolt, and a pin in the feed tray cover acted as the pivot between the two ends. The rearward movement of the bolt caused the rear end of the feed lever to pull to the right, causing the feeding pawl at the other end to move left over the belt. The pawl would pull the belt further to the right as the bolt came forward again, also sending the looseM1 linkof the previous round to be taken out of the belt to fly out the right side of the receiver. A recoil buffer tube extended from the back of the receiver to make the cycle of the bolt smoother than previous designs, to absorb some of the recoil of the bolt, and formed a place for the pistol grip to be installed.

Except for the M1919A6, all other variants had to be mounted on a tripod or other type of mount to be used effectively. The tripod used by infantry allowed traverse and elevation. To aim the gun along its vertical axis, the adjustment screw needed to be operated. This allowed the point of aim to be moved upwards or downwards, with free traverse to either side, allowing the gunner to set an elevation and sweep a wide band of fire across it by simply moving the gun from side to side. There was no need to control barrel climb or keep careful track of the fall of shots to make sure the fire was falling at the proper range. The gun was aimed using iron sights, a small folding post at the front end of the receiver and a rear aperture sight on a sliding leaf with range graduations from 200 to 1,800 meters in 200 meter increments. When folded down, the aperture formed a notch that could be used to fire the gun immediately without flipping up the leaf. The rear sight also had windage adjustment with a dial on the right side.

Operational use

Infantry

A Marine cradles his M1919 Browning machine gun in his lap inPeleliu

A US soldier takes aim with a tripod-mounted M1919A4 in Korea, 1953

As acompanysupport weapon, the M1919 required a five-man crew: the squad leader; the gunner (who fired the gun and when advancing carried the tripod and box of ammunition); the assistant gunner (who helped feed the gun and carried it, and a box of spare parts and tools); two ammunition carriers.The original idea of the M1919 was to allow it to be more easily packed for transport and featured a light barrel and bipod when first introduced as the M1919A1. Unfortunately, it quickly became clear that the gun was too heavy to be easily moved, while at the same time, too light for sustained fire. This led to the M1919A2, which included a heavier barrel and tripod, and could sustain fire for longer periods.

The M1919A4 weighed about 31 pounds (14 kg), and was ordinarily mounted on a "lightweight" (14 lb), low-slung tripod forinfantryuse (light and low compared to the previous M1917 tripod). Fixed vehicle mounts were also employed. It saw wide use inWorld War IImounted onjeeps,half-tracks,armored cars,tanks,amphibious vehicles, and landing craft. The M1919A4 played a key role in the firepower of the World War II U.S. Army. Each infantry company normally had a weapons platoon in addition to its other organic units. The presence of M1919A4 weapons in the weapons platoon gave company commanders additional automatic fire support at the company level, whether in the assault or on defense.

The M1919A5 was an adaptation of the M1919A4 with a forward mounting point to allow it to be mounted in tanks and armored cars. This, along with the M37 (another M1919 variant) and theBrowning M2 machine gun,was the most common secondary armament during World War II for theAllies.ThecoaxialM37 variant had the ability to feed from either the left or the right of the weapon and featured an extended charging handle similar to those on the M1919A4E1 and A5. A trial variant fitted with special sighting equipment was designated M37F.

Another version of the M1919A4, the M1919A6, was an attempt to make the weapon into a true light machine gun by attaching a bipod, buttstock, carrying handle, and lighter barrel (4 lb (1.8 kg) instead of 7 lb (3.2 kg)). The M1919A6, with a wooden buttstock, handle, pistol grip and bipod directly mounted to the body of the weapon was in fact one pound heavier than the M1919A4 without its tripod, at 32 lb (15 kg), though its bipod made for faster deployment and enabled the machine gun team to dispense with one man (the tripod bearer).The A6 version saw increasing service in the latter days of World War II and was used extensively inKorean War.While the modifications were intended to make the weapon more useful as a squadlight machine gun,it was a stopgap solution. Even though it was reliable, it proved somewhat impractical for its intended role.

In the late 1950s, an M1919 designed for remote firing via a solenoid trigger was developed for use in theXM1/E1armament subsystem was designated M37C. The US Navy later converted a number of M1919A4s to 7.62mm NATO chambering and designated them Mk 21 Mod 0; some of these weapons were employed in Vietnam War in riverine warfare patrols.

From the 1960s until the 1990s, theIsrael Defense Forces(IDF) used ground tripod and vehicle-mounted M1919A4 guns converted to 7.62 mm NATO on many of their armored vehicles and M3 personnel carriers. Israel developed a modified link for these guns due to feeding problems with the original US M1 link design. The improved Israeli link worked with.30 caliber, 7.62 mm NATO and8×57 mmcartridges.

Aircraft

AnAviation Ordnancemanstationed at theNaval Air Station Corpus Christiinstalling an AN-M2 Browning machine gun in aPBYflying boat,c. 1942

With assistance from firearms engineers atFabrique Nationale de Herstal,Belgium, the Model 1919 was completely re-engineered into the.30 caliber AN/M2 (Army-Navy) aircraft machine gun (not to be confused with the.50 caliber AN/M2or the20mm AN/M2,the two other primary US aircraft weapons of WWII). The.30 in M2/AN Browning was widely adopted as both a fixed (offensive) and flexible (defensive) weapon on aircraft. Aircraft machine guns required light weight, firepower, and reliability, and achieving all three goals proved a difficult challenge, with the mandate for a closed bolt firing cycle to enable the gun to be safely and properlysynchronizedfor fixed-mount, forward-aimed guns firing through a spinning propeller, a necessity on many single-enginedfighter aircraftdesigns through to nearly the end of World War II. The receiver walls and operating components of the M2 were made thinner and lighter, and with air cooling provided by the speed of the aircraft, designers were able to reduce the barrel's weight and profile. As a result, the M2 weighed two-thirds that of the 1919A4, and the lightened mechanism gave it a rate of fire approaching 1,200 rpm (some variants could achieve 1,500 rpm),a necessity for engaging fast-moving aircraft. The M2's feed mechanism had to lift its own loaded belt out of the ammunition box and feed it into the gun, equivalent to a weight of 11 lb (5 kg).In Ordnance circles, the.30 M2/AN Browning had the reputation of being the most difficult-to-repair weapon in the entire US small arms inventory.

The M2 also appeared in a twin-mount version which paired two M2 guns with opposing feed chutes in one unit for operation by a single gunner, with a combined rate of fire of 2,400 rpm. All of the various.30 M2 models saw service in the early stages of World War II, but were phased out beginning in 1943, as hand-trained rifle-caliber defensive machine guns became obsolete for air warfare (the.50 in/12.7 mm M2/AN Browning and 20 mmAN/M2automatic cannon had replaced the.30 in as offensive air armament as well). The.30 in M2 aircraft gun was widely distributed to other US allies during and after World War II, and in British and Commonwealth service saw limited use as a vehicle-mounted anti-aircraft or anti-personnel machine gun.

Other calibers

The same basic weapon, albeit modified to fire from an open bolt to preventcooking offofcordite,was also chambered for the British.303round, and was used as theUnited Kingdom'sprimary offensive (fixed forward firing) aircraft gun in fighters such as theSupermarine SpitfireandHawker Hurricaneand as fixed armament in bombers like theBristol Blenheim,theFairey Battle,Handley Page HampdenandMartin Maryland,until the widespread introduction of the larger 20mm caliberHispano-Suiza Mk.IIcannon, and throughout the war as defensive turret weapons in bombers. British night fighterde Havilland Mosquitoesused quartets of.303 Brownings in the nose andBristol Beaufightersused six in the wings, supplementing the main armament of four 20mm Hispano cannon in ventral fuselage mounts. Refer to#Browning.303 Mark IIfor more details.

It's often believed that the British modification to open bolt firing made it impossible to synchronize the guns to fire through the propeller arc, however.303 Brownings were indeed synchronized onGloster Gladiatorand some other early WWII designs.

Similar versions for a variety of European calibers were delivered by the Belgian gun makerFabrique Nationale(FN), notably German-standard7.92×57mm Mauserwhich was widely used inEastern Europe;and by Swedish gun makerCarl Gustaf SGFin6.5×55mmand8×63mmcalibers.

Argentina used Colt-manufactured guns chambered for the standard Argentine7.65×53mmcartridge.

On Lend-Lease British aircraft provided to the Soviets

The.303 variant equipped theHawker Hurricanesdelivered toSoviet Air Forces,during World War II (in both eight and twelve-gun variants). Soviet airmen compared them to their own, rapid-firing (at up to 1,800 rounds/min)ShKAS machine gunin terms of reliability: "But they often failed due to dust", recalled pilot Nikolai G. Golodnikov. "We tackled the problem gluingpercaleon all the machine-gun holes, and when you opened fire, bullets went right through. The machine guns became reliable then. They were of low efficiency when fired from distances of 150–300 m. "

Production

The M1919 was manufactured during World War II by three different companies in the United States: Buffalo Arms Corporation,Rock Island Arsenal,and the Saginaw Steering Gear division ofGeneral Motors.In the UK, production was chiefly byBSA.Originally unit priced at $667 each, mass production lowered the price to $141.44.

Variants and derivatives

The original M1919 tank MG

M1919A6 mounted on the tripod for an M1917

The originalM1919was designed for use with tanks.The water-cooled M1917 was inappropriate due to weight and the vulnerability of the water jacket. Browning modified the M1917 to be air-cooled by making changes that included dropping the water jacket and using a heavier barrel.

In total, there were six variants of the basic M1919 machine gun.

M1919A1

TheM1919A1introduced a newly strengthened bottom plate and some few other changes. It was meant to be used onMark VII tanksreplacing the earlier Marlin M1918 heavy machine guns.

M1919A2

TheM1919A2was another lightweight development specifically for mounted cavalry units, utilizing a shorter 18-inch barrel and a special tripod, though it could be fitted to either the M1917 or M2 tripods. This weapon was designed to allow greater mobility to cavalry units over the existing M1917 machine gun. The M1919A2 was introduced in 1922 and was used for a short period between World War I and World War II after the cavalry had converted from horses to wheeled and tracked vehicles.

M1919A3

TheM1919E1,commonly known as theM1919A3,was introduced in 1931 as an improved version of the M1919A2 for the infantry.

M1919A4

M1919A4 with spare barrel and accessories

The most common variant of the series was the M1919A4. Production blueprints of the new variant were complete in late 1936, and slow-scale production soon followed.The driving force behind the development of this variant was the lack of reliability in the previous 18-inch barrel versions, which did not produce enough recoil to cycle the action reliably. The gun was given a heavier "bull barrel", much thicker and was lengthened to 24 in (0.61 m) like the M1917, for cooling purposes, and arecoil boosterto enhance cycling performance, even with the heavier barrel. Various other small adjustments to the design were made, such as moving the front sight from the barrel jacket to the receiver, which made it easier to mount the gun on vehicles. The design of the barrel jacket was changed to include circular holes instead of long slits of earlier models. The recoil buffer assembly was also a new addition to the design between A3 and A4 development, designed to reduce the impact of the bolt hitting the backplate.

The M1919A4 was used in both fixed and flexible mounts, by infantry and on vehicles. It was also widely exported after World War II and continues to be used in small numbers around the world. Two variants were developed specifically for vehicular use, the M1919A5, with an extended charging handle, and the M1919A4E1, a sub-variant of the M1919A4 refitted with an extended charging handle developed in the 1950s.

M1919A6

M1919A6 mounted on its bipod

During the war it became clear to the US military that theM1918 Browning Automatic Rifle,while portable, was not sufficient as a sustained fire weapon due to its fixed barrel and 20-round magazine. The M1919A4 was faster and cheaper to produce but did not have the portability of a rifle. Realizing that producing an entirely new replacement machine gun would take time, the military decided that a stop-gap solution would be best and adapted an existing design. The M1919A6 was an attempt at such a solution, to parallel the designs of the GermanMG 34andMG 42machine guns, each of which were portable for a squad weapon and were very effective at sustained fire.

The M1919A6 first saw combat service in the fall of 1943.It had a metal buttstock assembly that clamped to the backplate of the gun, and a front barrel bearing that incorporated both a muzzle booster and a bipod similar to that used on the BAR. A lighter barrel than that of the M1919A4 was fitted, and a carrying handle was attached to the barrel jacket to make it easier to carry. Previous M1919 designs could change the barrel, but it required essentially field stripping the gun to pull the barrel out from the rear – the pistol grip back plate, bolt group and the trigger group all had to be removed before the barrel could be replaced, and this put the gun out of action for minutes, and risked losing and damaging parts in the field.The M1919A6 muzzle device allowed the gun crew to replace the barrel from the front; an improvement, but still an awkward procedure compared to other machine guns of the day. The M1919A6 was a heavy (32 pounds, 15 kg) and awkward weapon in comparison with the MG34 (26 pounds, 12 kg) and MG42 (25 pounds, 11 kg) and was eventually replaced in US service by theM60 machine gun(23.15 pounds, 10.50 kg) in the 1960s.

T66

The M1919A6 was used bySpringfield Armoryin the late 1940s and early 1950s as a testbed for an interim general-purpose machine gun. It was rechambered for the experimental T65 series cartridges, culminating in 1951 with the T66 machine gun chambered for the T65E3 cartridge (one of the forerunners to the 7.62mm NATO cartridge). It had a new barrel with a flash-hider attachment, a shorter action, and modified M1 disintegrating belt links to feed the new cartridge. It was deemed still too heavy for field use and was not adopted.

.30 AN/M2

A specific aircraft version of the.30 caliber Model 1919A4 was manufactured by Browning as the.30 AN/M2.It had a thinner barrel and receiver walls to keep down weight. Compared to the M1919A4, the AN/M2 had a substantially higher rate of fire (1,200 to 1,500 rounds per minute). It was used on US aircraft early in World War II, but the lighter.30-caliber weapon was increasingly relegated to training duties as the war progressed. A derivative of this weapon was built by Colt as the civilian marketMG40.

It was later replaced by the larger caliber – and is not to be confused with – theBrowning Machine Gun, Cal..50, M2, Aircraft,with the smaller-calibre ordance bearing the official designation of "Browning Machine Gun, Cal..30,M2, Aircraft".The.50 AN/M2 "light barrel" version,used in the majority offixed and flexible/turretedmounts on U.S. World War II-era aircraft as the war progressed, lacked the massive "cooling collar" of the heavy barrel M2HB version, which is still in service with the ground forces of the U.S. military in the 21st century.

The AN/M2 was responsible for seriously wounding "one of the best Japanese fighter pilots of the war" flying aceSaburō Sakaiwhen he attacked eightSBD Dauntlessesfrom behind mistaking them forF4F Wildcatfighters.

The"Stinger"was a field modification by Marines in thePacific Theaterduring World War II and used on the ground as a light machine gun. These were salvaged from crashed and disabled aircraft and fitted with a bipod (spade grips still attached). Later more extensive modifications led to six being fitted with a custom trigger,M1 Garandbuttstock,M1918 Browning Automatic Riflebipod and rear sights to allow for use without a tripod or other mount.The resulting weapon was a belt-fed, 40 in (1.0 m) long, 25 lb (11 kg) gun and fired three times as fast as the M1919A6's of the day. The Stinger was recommended as a replacement for the BAR in squads however the war ended just six months later.Marine CorporalTony Steinused a "Stinger" during the invasion ofIwo Jima.Stein would posthumously receive theMedal of Honorfor his actions during the battle. "

Flygplanskulsprutam/22

Flygplanskulsprutam/22, (fpl)ksp m/22 for short, was a Swedish variant of the.30 AN/M2 aircraft machine gun.The name translates to "airplane machine gun model 22". It was originally used by the Swedish army's aviation branch but moved over to the Swedish air force when it was formed in 1926. The first guns delivered were built by Colt but Sweden later got a license to produce the weapon domestically. Thekspm/22 stayed in active service all the way to 1957, although by then only in agunpodfor ground strafing.Originally thekspm/22 was chambered in6.5x55 mmbut in 1932 almost all guns where re chambered to8x63 mm.

Browning.303 Mark II

The Browning.303 four-gunFN-20tail gunturret on anAvro Lancaster

The Browning was adopted by theRoyal Air Forceas a replacement for the.303Vickers machine gunand manufactured byVickers ArmstrongandBSAto fire theBritish.303 inch (7.7 mm)round and named "Browning.303 Mk II" in British Service. It was essentially the 1930 Pattern belt-fed Colt–Browning machine gun with a few modifications for British use, such as firing from an openboltto avoid cooking off the cordite rounds and a lighter bolt, increasing the rate of fire, much like the US.30 M2/AN aircraft variant. It was designed to fire hydraulically or pneumatically as a wing mounted machine gun but was also adopted as hand-fired mount for use in bombers and reconnaissance aircraft. It had a rate of fire of 1,150 rounds per minute.The license was issued to BSA by July 1935.

The Browning.303 was used as the RAF andFleet Air Arm(FAA) primary fixed forward firing aircraft armament before the war, both insynchronizedmounts (firing through a spinning propeller) on pre-war biplane fighters (Gloster Gladiator,Hawker Fury) and on the UK's new 'eight-gun fighters' theHawker HurricaneandSupermarine Spitfireand the navalFairey Fulmar,and as secondary weapons in mid-war variants of the Spitfire, as well as being fitted in single, double or quadruple mounts as offensive weapons for theBristol Blenheim,theFairey Battle,Handley Page Hampden,Martin Maryland/Baltimore,Fairey Swordfish,Lockheed Hudson,Douglas Boston,Blackburn SkuaandBristol Beaufort.It was also used as aturret gunin variousBoulton PaulorNash & Thompsonturrets on bombers and flying boats. Even after the introduction of autocannon as primary fighter armament.303 Brownings were retained as supplementary weapons on many aircraft including later versions of the Spitfire, as well as fighter-bomber and night fighter versions of thede Havilland Mosquito,among others.

For hand-held moveable mount use theVickers K machine gunwas preferred. There is pictorial evidence of the.303 Browning being placed on improvised bipods for ground use during the early campaigns in Burma and Malaysia.

M37

In the late 1940s and early 1950s the US military was looking for an upgrade to the M1919 that could feed from either side for use as an improvedcoaxialmachine gun. Saco-Lowell developed a model that had the driving spring attached to the back plate (eliminating the need for a mainspring and driving rod protruding out the back of the bolt), a solenoid trigger for remote firing, a feed cover that could open from either side, a bolt with dual tracks that could feed from either side, and a reversible belt feed pawl, ejector, and feed chute. The experimental T151 had a flat backplate, the T152 had spade grips and a "butterfly" trigger like the M2HB, and the T153 had a pistol grip and back-up trigger like the M1919A4 and an extended charging handle similar to those on the M1919A5. The T153 was adopted as the M37 and was produced by SACO-Lowell and Rock Island Arsenal from 1955 to 1957. It was in regular service from 1955 until it was replaced by the M37E1 in the late 1960s and the M73A1 in the early 1970s.

The M37 was used mostly on the M47 and M48 Patton medium tanks. TheM37Fwas a trial variant fitted with special sighting equipment. TheM37Cwas a variant without a sight bracket designed for use in aircraft armament (like the skid-mountedXM1/E1helicopter armament subsystem).

TheM37E1was a M37 machine gun converted by Rock Island Arsenal and Springfield Armory to chamber the 7.62×51mm NATO cartridge and feed the M13 disintegrating belt. They were designed for interim use until theM73 machine guncould be fielded.The M37E1 was to be standardized as the M37A1 but development of the improved M73A1 precluded this.

Mk 21 Mod 0

Mk 21 inVietnambeing fed by an upside-down M-13 link belt (the links are not visible)

The increasing American involvement in Vietnam created a demand for small arms, especially the new M60 machine gun. The Navy had surplus machine guns left over from World War 2 and Korea, but they were chambered for the earlier.30-06 Springfield cartridge rather than the new standard 7.62mm NATO cartridge. TheMk 21 Mod 0was a US Navy conversion of the.30 M1919A4 to fire the7.62mm NATOcartridge. This was accomplished by replacing the barrel, bolt, and feed cover and adding a chamber bushing, a link-stripper, and a second belt-holding pawl to allow it to feed and fire the new cartridge.Spacer blocks were added to the front and back of the feedway to guide the shorter round and block the use of the longer.30-06 Springfield ammunition.A six-inch flash hider was also added to the barrel to reduce the muzzle flash.

The conversions were performed from 1966 through 1967 atNaval Ordnance Station Louisville.Modified M1919A4s had the designation "Machine Gun, 7.62mm / Mk 21 Mod 0" stamped on the receiver sideplate in 1/4-inch lettering. The replacement barrels had "7.62mm NATO-G" stamped on them in 1/8-inch letters to differentiate them from M1919A4 or M60 barrels;the letterGindicated it used a grooved barrel bushing.

It used the standard 7.62mm NATOM13 link"strip-out" disintegrating link,in which the bolt pushes the round out of the bottom of the two-part link and then forwards into the breech.The oldM1 link"pull-out" disintegrating links, which are pulled backwards out of the one-piece link by the extractor towards the bolt and then forwards into the breech, would not feed through the new mechanism.The M1 links, which were designed for the longer and thinner.30-06 Springfield, would also be too narrow to fit the shorter and thicker 7.62mm NATO round. The US Navy, because of their narrower inventory of 7.62mm NATO ammunition, used linked belts of either 7.62mm M80 Ball or a 4:1 ratio mix of 7.62mm M80 Ball and 7.62mm M62 Tracer.

The refurbished feed mechanism was left-hand feed only. It was different from the one in the M60 GPMG in that the open end of the belt had to be on top so it could be stripped out.To prepare the ammo, gunners had to take out both of the 100-round belts from an M19A1 ammo can, had to link them both together, and then loaded the resultant 200-round belt back into the M19A1 can upside-down so it would feed correctly.

International variants and derivatives

Fokker D.XXI ofFinnish Air Force

Belgian paratrooper vehicle

The M1919 pattern has been used in countries all over the world in a variety of forms and under a number of different designations.

• The Browning Mk 1 and Mk 2 were older-style Commonwealth designations for the.303 Browning machine guns used on the vast majority of British aircraft of World War II. The difference between the Mk 1 and Mk 2 versions is unknown,but the weapon visually is quite similar to the AN/M2 aircraft gun. Post-war the L3 designation was used by theUnited KingdomandAustraliato designate the fixed (A1) and flexible (A2) versions of the M1919A4 in.30-06. L3A3 and L3A4 denoted sear hold-open conversion of previous L3A1s and L3A2s. The A3 is the modified version of the A1, and the A4 is the modified version of the A2.
• While theRCAFhad used a mix of.303 Brownings and later.30-06 Brownings on aircraft duringWorld War IIand theKorean War,theCanadian ArmyandRoyal Canadian Navyhad largely used M1919A4s in.30-06 during both conflicts,having them mainly mounted on vehicles/vessels. Canada had also kept the base American name(s) as the designation and had not used Commonwealth designations for them like the United Kingdom and Australia.When theCanadian Forcesadopted7.62×51mm NATOrechambered M1919A4s during the 1950s (same time as theFN FALandSterling SMGadoption) they gave the two variants of theGPMGseparate designations; for fixed application the 'C1' and for flexible application the 'C1A1'. Not long after entering service they were renamed C5 and C5A1 after being upgraded, being product improvements of the previous C1 and C1A1 respectively.They would be used by infantry and mounted on a variety of vehicles including theIltis,M38A1,M151A2,CJ-7,M113A1and M113A2 series,Lynx reconnaissance vehicle,Ferret Armoured Car,Centurion Tank,Husky AVGPand theMLVWamong others.The C5 GPMG series was in service till the mid 1990s, when they had been fully replaced by theC6 GPMGand theC9 LMG,with the remaining weapons going into storage.
• TheRhodesian Air Forceused twin Browning Mk 2 models, chambered in the British.303cartridge, mounted onAlouette IIIG-Car helicoptersas well as modified variants fitted withFN MAGbipods, pistol grips and stocks for ground use.
• The Browning was produced by FN-Herstal in Belgium as well, being used in, among others, theFokker D.XXIand IAR-80/81 fighters.
• MG A4 is theAustriandesignation for the M1919A4.
• MG4 is a South African upgrade of the M1919 in current use with theSouth African National Defence Force.The MG4 upgrade was done byLyttleton Engineering Works,Pretoria.
• MG m/52-1 and MG m/52-11 were Danish designations for the M1919A4 and M1919A5 respectively.
• TheIsrael Defense Forces(IDF) used vehicle-mounted M1919A4 guns converted to 7.62mm NATO on many of their armored vehicles.
• Ksp m/22is the Swedish designation for license-built M1919s chambered for8×63mm patron m/22cartridges, for aircraft use.
• Ksp m/39is the Swedish designation for M1919A4 license-built byCarl Gustafs Stads Gevärsfaktorichambered in6.5×55mmand8×63mm patron m/32,and from about 1975 rebarreled in7.62×51mm NATO.Intended for use in tanks and armoured vehicles, it's available with both left- and right hand feeding, the former is used inCV 90.
• Ksp m/42was the Swedish designation for license-built M1919A6 used for infantry support, normally chambered in6.5×55mmbut occasionally in8×63mm patron m/32,and from about 1975, mostly fitted with barrels in7.62×51mm NATO.The Ksp m/42B was a lighter version with bipod and shoulder stock (used in a similar way as the M1919A6), chambered in 6.5×55mm and later in 7.62×51mm. Even the ksp m/42B proved too heavy and was replaced by the ksp m/58 (FN MAG). In the late 1980s, most remaining ksp m/42 was rebuilt into ksp m/39 to be installed into the CV 90s.
• The Poles developed a copy of the Browning M1919 chambered for 7.92×57mm Mauser, designatedCkm wz.32,similar to the earlierCkm wz.30.

Commercial variants and derivatives

Colt MG40

Colt produced a derivative of the M2 aircraft machine gun, the Colt MG40. It shipped in a variety of calibers, including the basic.30-06 Springfieldand popular7mm Spanish Mauser,and was available in left- or right-hand feed.
The MG40-2 Light Aircraft Machine Gun could be used in flexible- (pintle-mounted), fixed- (wing-mounted), or synchronized- (through the propeller) models.The Flexible mount machine gun came with grips and a "butterfly" trigger plate like the standard ground model. The Fixed model had a backplate. It used a cable connected to an operating slide connected to a stud on the bolt to fire it; tension in the cable causes the trigger to activate and slack in the cable causes it to stop.The synchronized variant of the Fixed model had a trigger motor for through-propeller, gun synchronizing needs.

FN variants

FN Herstal developed a family of machine guns analogical to Colt's commercial line in 1930s, and those, even though not well-known, were used by many European countries during WWII

Civilian ownership in the US

The Browning M1919 remains popular with civilian enthusiasts in the United States, though changes in 1986 to theNational Firearms Act of 1934(the US Federal law regulating private ownership of machine guns) prohibited the registration of new machine guns for sales to civilians, thus freezing the number of "transferable" machine guns in private ownership. The inflation of prices that followed, and the availability of parts from surplussed and scrapped machine guns, led to the development of semi-automatic versions of the Browning M1919. Typically, these are built using a new right sideplate (the portion legally considered the "firearm" under US law), which has a raised "island" protruding into the interior of the receiver. This requires the use of a modified bolt, barrel extension and lock frame which have been designed to allow only semi-automatic firing. The "island" prevents the insertion of unmodified full-automatic parts. A number of small gun companies have produced these "semi-auto machine guns" for commercial sales. The fairly simple modifications necessary to convert M1919 parts to the semi-automatic version, and the relatively easy process of riveting used in the assembly of the Browning machine gun's receiver, have also made it a popular gun for hobbyists to build at home.

Similar "semi-auto machine guns" have been built using parts from other Browning pattern machine guns, to include the AN/M2 aircraft gun and FN30, and variations that never saw military use such as extremely short (8 ") barreled guns.

Current and former users

• Algeria
• Angola
• Argentina
• Australia
• Austria:1,605 M1919A4s, known as MG-A4. Used into the 1970s.
• Brazil
• Bolivia
• Botswana
• Burundi
• Cambodia
• Canada
• Central African Republic
• Chile
• China:M1919A4 Browning were used by theX Forceand M1919A6 Browning were later supplied by theOSSto American trained Chinese commandos in 1945.
• Colombia
• Costa Rica
• Brigade 2506
• Denmark:7.62 MG M/52
• Dominican Republic
• Egypt
• El Salvador
• Estonia
• Ethiopian Empire
• Finland
• France
• Democratic Forces for the Liberation of Rwanda
• Gabon
• Greece
• Guatemala
• Haiti
• Hong Kong:Used by theRoyal Hong Kong Regiment.
• Indonesia
• Iran
• Ireland
• Israel
• Italy
• Japan:used post-war
• Katanga
• South Korea:TheArmed Forcesreceived 186 M1919A4s and 325 M1919A6s before theKorean War,and 4,402 M1919A4s and 2,675 M1919A6s were in service with theArmyby the end of the war.
• Kingdom of Laos:Received M1919A4 and M1919A6 from US Government duringVietnam WarandLaotian Civil War.
• Lebanon
• Liberia
• Libya
• Luxembourg
• Madagascar
• Malta
• Mauritania
• Mexico
• Mongolia
• Morocco
• Myanmar
• Nepal
• New Zealand
• Nicaragua
• Nigeria
• Panama
• Philippines
• Portugal
• Romania
• Rhodesia
• Sierra Leone
• Somalia
• South Africa
• Soviet Union:Operated those fitted on Lend-Lease vehicles and planes
• Spain
• Sweden
• Syrian National Coalition
• Taiwan
• Thailand
• Tunisia
• TurkeyM1919A4/M1919A6 Saw action during1974 Cyprus War.
• United Kingdom
• United States
• Uruguay
• South Vietnam
• Vietnam
• Zaire

See also

• Dieudonné Saive
• M2 Stinger
• Maxim-Tokarev
• List of U.S. Army weapons by supply catalog designationSNL A-6
• M1917 Browning machine gun
• M2 Browningmachine gun
• Edward Colquhoun Charlton(using an M1919 from hisSherman tankin 1945) was awarded theVictoria Cross

Bibliography

• Drabkin, Artem (2007).The Red Air Force at War: Barbarossa & the retreat to Moscow – Recollections of Fighter Pilots on the Eastern Front.Barnsley (South Yorkshire, UK): Pen & Sword Military.ISBN1-84415-563-3.
• Goldsmith, Dolf L.The Browning Machine Gun,Vol. I & II.
• Rottman, Gordon L. (2014).Browning.30-caliber Machine Guns.Weapon 32. Osprey Publishing. p. 68.ISBN9781780969213.
• Smith, Joseph E. (1969).Small Arms of the World(11th ed.). Harrisburg, Pennsylvania: The Stackpole Company.ISBN9780811715669.

External links

• (1986) C-71-126-000 Parts Identification Lists - Machine Gun, 7.62mm, C5A1
• Gothia Association for Weapon History on the Ksp m/42
• Flygplanskulspruta m/22
• M37: The Ultimate Improved Browning 1919Forgotten Weapons