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AR-15–style rifle

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(Redirected fromAR-15)
"AR15" redirects here. For other uses, seeAR15 (disambiguation).

Riflesstyled like the AR-15 come in many sizes and have many options, depending on the manufacturer. The lowerreceiver,without the receiver extension, rear takedown pin, and buttstock, is shown at bottom.

AnAR-15–style rifleis a lightweightsemi-automatic riflebased on or similar to theColt AR-15design. The Colt model removed theselective firefeature of its predecessor, the originalArmaLite AR-15,itself a scaled-down derivative of theAR-10design byEugene Stoner.It is closely related to the militaryM16 rifle.

ArmaLitesold thepatentand trademarks for both toColt's Manufacturing Companyin 1959 after the military rejected the design in favor of theM14.After most of the patents for the Colt AR-15 expired in 1977, many firearm manufacturers began to produce copies of the rifle under various names. While the patents are expired, Colt has retained thetrademarkto theAR-15name and is the sole manufacturer able to label their firearms as such.[1]

From 1994 to 2004, theFederal Assault Weapons Banrestricted the sale of the Colt AR-15 and some derivatives in the United States, although it did not affectrifleswith fewer listed features.[2][3]After the phrase "modern sporting rifles",to be used synonymously with the AR-15 style, was coined in 2009 by the USNational Shooting Sports Foundation(NSSF), a firearms trade association, it was quickly adopted by much of the industry.[4][5]Beginning in the 2010s, AR-15–style rifles became one of the "most beloved and most vilified rifles" in the United States, according toThe New York Times;the rifles have gained infamy due in part to their use in high-profilemass shootings.[6]Promoted as "America's rifle" by theNational Rifle Association of America,[7]their popularity is partially attributable toactive restrictions,or proposals to ban or restrict them.[8][9][10]They are emblematic as being on the frontline of thedebate over U.S. gun control.

Terminology[edit]

The "AR" in AR-15 stands for "ArmaLite Rifle",[11]and "AR-15" is most-commonly used to referonlyto the civiliansemi-automaticvariants of the rifle which lack thefully automaticfunction.[12]A common misconception is that "AR" is an abbreviation for "assault rifle"or"automatic rifle",[13][14][15]perhaps because of the weapon's inclusion in theFederal Assault Weapons Banin 1994, or because theArmaLite AR-15was originally designed to replace theM14 riflein theVietnam War.[16]

The AR-15 is closely related to the militaryM16andM4 Carbinerifles, which all share the same core design. Invented by infantry rifle designerEugene Stonerin 1956 for use in the7.62 NATOcaliberArmaLite AR-10battle rifle,the design features agas-operated,rotating boltcombined with an integral piston (instead of a conventionaldirect impingement,operating system), and was patented underU.S. patent 2,951,424.[17][18]A lighter weightselective firevariant of the AR-10 was designed in 1958 for military use and designated the ArmaLite model 15, or AR-15.[19][16]Due to financial problems and limitations in terms of manpower and production capacity, ArmaLite sold the AR-15 and AR-10 designs andtrademarkstoColtin 1959.[20]

1973 Colt AR-15 SP1 rifle with 'slab side' lower receiver (lacking raised boss around magazine release button) and original Colt 20-roundbox magazine

In 1964, Colt began selling its own version with an improved semi-automatic design known as theColt AR-15.[21]After Colt's patents expired in 1977, an active marketplace emerged for other manufacturers to produce and sell their own semi-automatic AR-15–style rifles.[1]Some versions of the AR-15 were classified as "assault weapons"and banned under the Federal Assault Weapons Ban in 1994 within theUnited States.This act expired in 2004.[2][22]

In 2009, the term "modern sporting rifle" was coined by theNational Shooting Sports Foundationfor its survey that year as a marketing term used by the firearms industry to describemodularsemi-automatic rifles including AR-15s.[23][4][24][12]Today, nearly every major firearm manufacturer produces its own generic AR-15–style rifle.[25][24]As Colt continues to own and use the AR-15 trademark for its line ofAR-15 variants,other manufacturers must use their own model numbers and names to market their AR-15–style rifles for commercial sale.[26]

Under US law, when fitted with a barrel less than 16 inches (41 cm) and lacking any rear shoulder support, it is legally considered a pistol as opposed to being ashort-barreled rifle,[27]and is described as anAR-15–style pistol.

The lower receiver alone is legally defined as a firearm under United States federal law. However, this definition may be questionable due to several court rulings (or government dismissals to avoid rulings) that the AR-15 lower receiver does not match the legal definition in 27 CFR § 479.11,[28][29][30]though a 2021 case from the Eighth Circuit found otherwise.[31]

Modularity and customization[edit]

While most earlierbreech-loading rifleshad a singlereceiverhousing both the trigger and reloading mechanism, an innovative feature of the AR-15 was modular construction to simplify substitution of parts and avoid need forarsenalfacilities for most repairs of malfunctioning military rifles.[32]A distinctive two-part receiver is used by both military and sporting AR-15–style rifles.

As civilian ownership of AR-15–style rifles became sufficient to create a market for improvements, numerous manufacturers began producing aftermarket parts—including parts with features not found on basic AR-15 rifles, and individuals with basic mechanical aptitude can often substitute these pieces for original equipment without needing a gunsmith. Due to the vast assortment of aftermarket parts and accessories available, AR-15–style rifles have also been referred to as "the Swiss Army knife of rifles",[33]"Barbie Dolls for Guys",[34][35]or "LEGOs for adults".[36][37][38]These more or lessinterchangeable modulesare a defining characteristic of AR-15–style rifles.[39]

A stripped lower receiver, one that is lacking the additional parts included in a completed lower receiver, is the only part of an AR-15–style rifle that needs to be transferred through a federally licensed firearms dealer under United States federal law.[40]

The lower receiver includes thetrigger guardin front of the detachablepistol grip,and behind the magazine well. Lower receivers may be bought "stripped" —a single solid part and legally a firearm in the United States, albeit nonfunctional, with no fire control group or lower parts kit installed. End users may install their own choice of fire control group and lower parts kit. The lower receiver holds thetriggerassembly including thehammer,and is the attachment point for thebuttstock.The lower receiver is attached to the upper receiver by two removable pins. Disassembly for cleaning or repair of malfunctions requires disengaging these pins from the upper receiver. Releasing the rear take-down pin allows the receiver to be opened by rotation around the forward pivot pin as ahinge.[32]

The upper receiver contains theboltcarrier assembly and is attached to thebarrelassembly.Sightsmay be attached to the upper receiver or the barrel assembly. A handguard usually encloses the barrel and is attached to the upper receiver, and depending on the handguard, also attached to the barrel's gas block.[32]

Folding stocks[edit]

AR-15–style rifles may have folding or collapsible stocks which reduce the overall length of the rifle when folded, although some designs of the stock folding device may not allow the firearm to be fired until unfolded, or only fire once until unfolded.[41]A few manufacturers have made full upper receivers,[42]or even "bufferless" bolt carrier systems where the buffer system is wholly contained in the upper receiver, and therefore does not use the buffer tube, which allows for firing while the stock is in the folded position, or removal of the stock altogether.[43]

Gas systems[edit]

The standard design includes a gas block and tube to vent burnt powder gas back into the bolt carrier assembly where it expands in a variable volume chamber forcing the bolt open to eject the spent cartridge case. The buffer spring in the buttstock then pushes the bolt closed after picking up a new cartridge from the magazine. ThisStoner bolt and carrier piston systemhas the disadvantage of venting un-burnedsmokeless powderresidue into the receiver where it may ultimately accumulate in quantities causing malfunctions. Some AR-15–style rifles use an alternativeshort-stroke gas pistondesign borrowed from theArmaLite AR-18,where a metal rod pushes against the bolt carrier, driven by a piston located just behind the barrel gas port. This piston design keeps the rifle cleaner by not exhausting in to the receiver.[44]Other AR-15–style rifles feature redesigned gas systems so the rifle is "over-the-beach capable", allowing it fire safely as quickly as possible after being submerged in water.[45][46]The original design features a free-floatingfiring pin.To theoretically reduce the risk ofslam-firing,the HK416 and its civilian variant MR556 feature a proprietary firing pin safety in the bolt. Such firing pin safeties may obstruct the upper from working with standard AR-15-type full height hammers located in the fire control group of the lower.[47]

Left-handed users[edit]

Most rifles eject spent cartridges from the right side of the receiver away from right handed shooters who place the butt against the right shoulder while sighting with the right eye and using a finger of the right hand to pull the trigger.[48]Right-side ejection is a disadvantage for the third of the population whose left eye isdominant,[49]and for the tenth of the population who areleft handed,[50]because holding these rifles against their left shoulder for maximum accuracy may cause the rifle to eject hot spent cases toward the chest, neck, or face of aleft handed shooter.[51]When the M16A2 was adopted by the Army in 1986, it incorporated a built-in brass deflector to keep ejected cartridges from hitting the user. Most civilian variants also copy that feature.[52]The modular design of AR-15–style rifles has encouraged several manufacturers to offer specialized parts including leftward ejecting upper receivers and left-handed bolts/bolt carriers for converting right handed AR-15–style rifles for left-handed use.[53][54][55]

Ambidextrous lower receivers, magazine releases, and safety selectors have also been produced, allowing release of the magazine from the left side, closing of the bolt from the right side, and operation of the safety from the right side, respectively.[56]

Calibers[edit]

Main article:List of AR platform cartridges § AR-15 cartridges

The AR-15 is nominally chambered in.223 Remingtonor5.56×45mm NATO,with the.223 Wylde chamberallowing for the safe chambering of both, but many variants have been produced in different calibers such as.22 LR,7.62×39mm,9×19mm Parabellum,[57]6.5mm Grendel,and shotgun calibers.[58]Some of these firearms chambered in smaller calibers such as 9mm or.22 utilizesimple blowback[59]ordelayed blowback[60]operating principles instead of the default direct impingement/internal-piston based operating system, as insufficient gas pressure or volume is produced by the round to cycle the action, or the simpler blowback system is sufficient and may allow removal of the rear buffer tube and spring.

Compliance with state or local restrictions[edit]

Some AR-15–style rifles limit use of detachable magazines to comply with state regulations.[61][62]Nearly all versions of the civilian AR-15 have a pistol grip like the military versions, but as the pistol grip is generally removable, grips and stocks that comply with various restrictions are available.[63]

While AR-15–style rifles are banned inNew York City,the FightLite SCR has been explicitly allowed, even though it accepts standard AR-15 upper receivers.[64][65]The SCR lower receiver differs from the standard AR-15 lower receiver in that it uses aMonte Carlo stockinstead of a pistol grip, which may allow it to be legally possessed in jurisdictions with assault weapon restrictions in place. It also uses a proprietary bolt carrier due to the angled buffer tube, and a proprietary fire control group that moves the trigger rearward.[66]

A few manufactures offerbolt actionorpump action[67][68]AR-15–style rifles incapable of semi-automatic fire.[69]These are most commonly marketed in jurisdictions where ownership of semi-automatic centerfire rifles are heavily restricted, such asin the United Kingdomand Australia.

Comparison to military versions[edit]

The semi-automatic civilian AR-15 was introduced by Colt in 1963. The primary distinction between the civilian semi-automatic rifles and the military assault rifles isselect fire.Military models are produced with multiple firing modes: semi-automatic fire, fully automatic fire mode and/orburst firemode, in which the rifle fires several rounds in succession when the trigger is depressed. Most components are interchangeable between semi-auto and select fire rifles including magazines, sights, upper receiver, barrels and accessories.[70][71]The military M4 carbine typically uses a 14.5-inch (37 cm) barrel. Civilian rifles commonly have 16-inch (41 cm) or longer barrels to comply with theNational Firearms Act.[72]

To prevent a civilian semi-automatic AR-15 from being readily converted for use with the select fire components, several features were changed. Parts changed include the lower receiver, bolt carrier, hammer, trigger, disconnector, and safety/mode selector. The semi-automatic bolt carrier has a longer lightening slot to prevent the bolt's engagement with an automatic sear. Due to a decrease in mass, the buffer spring is heavier. On the select-fire version, the hammer has an extra spur which interacts with the additional auto-sear that holds it back until the bolt carrier group is fully in battery, when the automatic fire is selected.[73]Using a portion of the select fire parts in a semi-automatic rifle will not enable a select fire option (this requires a registered part with theATF). Lower receivers that are select-fire are identified by a pinhole above the safety/mode selection switch.[74][75][76][77]As designed by Colt, the pins supporting the semi-auto trigger and hammer in the lower receiver are larger than those used in the military rifle to prevent interchangeability between semi-automatic and select-fire components. The pivot pin may also be slightly larger in diameter.[78][79]

Production and sales[edit]

After the 2004 expiration of theFederal Assault Weapons Ban,the firearms industry embraced the AR-15's political and cultural significance for marketing.[80]Almost every major gunmaker produces its own version, with ~16 million Americans owning at least one.[80]

The first version produced for commercial sale by Colt was the SP1 model AR-15 Sporter in.223 Remington, with a 20-inch (51 cm) barrel and issued with five-round magazines.[21]Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use.[81]Military development of compact military AR-15 carbines encouraged production of a 16-inch (41 cm) barreled civilian SP1 carbine with a collapsible buttstock beginning in 1977. These carbines have become popular for police use in confined urban spaces, and the collapsible buttstock compensates for the additional thickness ofbody armor.The shorter barrel reduced bullet velocity by about five percent, and bullet energy by about 10%. The shorter barrel required moving the gas port closer to the chamber, exposing the self-loading system to higher pressures and temperatures which increased stress on moving parts like the bolt lugs and extractor. Although Colt offered a heavier 20-inch (51 cm) barrel for improved accuracy beginning in 1986, increased barrel weight may impairergonomicbalance; so shorter barrels have dominated recent rifle production.[82]

American Tactical OMNI AR-15–style rifle (lower in polymer),5.56×45mm NATOcaliber, with Millett DMS-1 scope and FAB Defense stock and grips

In the 1990s, sales of AR-15–style rifles increased dramatically, partly as a result of the introduction of the flat top upper receiver (M4 variant) which allowed scopes and sighting devices to be easily mounted as well as new features such as free floating hand guards that increased accuracy.[81]While only a handful of companies were manufacturing these rifles in 1994, by the 21st century the number of AR-15–style rifles had more than doubled.[78]From 2000 to 2015, the number of manufacturers of AR-15–style rifles increased from 29 to an estimated 500.[83]

AR-15–style rifles are now available in a wide range of configurations and calibers from a large number of manufacturers. These configurations range from standard full-sizes rifles with 20-inch (51 cm) barrels, to short carbine-length models with 16-inch (41 cm) barrels, adjustable length stocks and optical sights, to long range target models with 24-inch (61 cm) barrels, bipods and high-powered scopes.[84]

In September 2019, Colt Firearms announced it was discontinuing production of the AR-15 for the consumer market, citing "significant excess manufacturing capacity" across the industry and the company's "high-volume contracts" with military and police forces that were "absorbing all of Colt's manufacturing capacity for rifles".[85]However, in 2020, Colt resumed production of the AR-15, following a surge in demand in the United States consumer market.[86]

Estimates vary as to how many of the rifles are owned in the United States. The National Shooting Sports Foundation estimated in 2016 that approximately 5 million to 10 million AR-15–style rifles existed in the U.S. within the broader total of the 300 million firearms owned by Americans.[87]

Hunting[edit]

Many hunters prefer using AR-15–style rifles because of their versatility, accuracy, wide variety of available features, and wide variety of calibers (see below).[88]Collapsible stocks are convenient for hunters who pack their rifles into remote hunting locations or forlength of pulladjustments to fit any sized hunter.[89]Construction with lightweightpolymersandcorrosion-resistant alloys makes these rifles preferred for hunting in moist environments with less concern about rusting orwarpingwood stocks. Positioning of the AR-15safetyis an improvement over traditionalbolt actionhunting rifles. Many states require hunters to use reduced-capacity magazines.[90]If a hunter misses with a first shot, the self-loading feature enables rapid follow-up shots against dangerous animals likeferal pigsor rapidly moving animals likejackrabbits.[88]Hunters shooting larger game animals often use upper receivers and barrels adapted for larger cartridges or heavier bullets. Several states prohibit the use of.22 calibercartridges like the.223 Remington on large game.[91][92][93]

Cartridge variations[edit]

Since the upper and lower receivers may be swapped between rifles,forensic firearm examinationof bullets and spent cartridges may reveal distinguishing marks from the barrel and upper receiver group without identifying the lower receiver for which legal records may be available.[94]An individual may use several upper receiver groups with the same lower receiver. These upper receiver groups may have differing barrel lengths and sights and may fire different cartridges. A hunter with a single lower receiver might have one upper receiver with a.223 Remington barrel andtelescopic sightforvarmint huntingin the open country and another upper receiver with a.458 SOCOMbarrel andiron sightsforbig-game huntingin brushy woodland. The dimensions of upper and lower receivers originally designed for the 5.56×45mm NATO cartridge impose an overall length limit and diameter limits when adapting modules for other cartridges included in thislist of AR platform cartridges.[95][84]The same magazine in the lower receiver group may hold differing numbers of different cartridges.[44]

Crime and mass shootings[edit]

United States[edit]

Further information:Mass shootings in the United States

Most firearm-related homicides in the United States involvehandguns.[96][97][98]A 2019Pew Researchstudy found that 3% of US gun deaths were caused by rifles, a category which includes AR-15–style rifles.[99]According to a 2013 analysis byMayors Against Illegal Guns,14 out of 93 mass shootings involvedhigh-capacity magazinesorassault weapons.[100]Nevertheless, AR-15–style rifles have played a prominent role in many high-profile mass shootings in the U.S.[101]and have come to be widely characterized as the weapon of choice for perpetrators of these crimes.[102]AR-15s or similar rifles were the primary weapons used in half of the 10 deadliest mass shootings in modern American history:[103][104]the 2012Sandy Hook Elementary School shooting,the2017 Las Vegas shooting,the 2017Sutherland Springs church shooting,[105]the 2018Parkland high school shooting,[106]and the 2022Robb Elementary School shooting.[107]The first time wherein an AR-15–style rifle was used in a mass shooting was in 2007, during theCrandon shooting,according toMother Jones's mass shooting database.[108][109]Gun expert Dean Hazen and mass murder researcher Pete Blair think that mass shooters' gun choices have less to do with the AR-15's specific characteristics but rather with familiarity and acopycat effect.[110][111] According to the National Shooting Sports Foundation, there were an estimated 24.4 million AR-15s in private circulation in the United States in 2020. According to a 2021 Georgetown University poll of gun owners in the US, 24.6 million persons have an AR-15 or a comparable firearm in their possession.[112]On July 13, 2024, at aTrump rallyinButler,Pennsylvania,anassassination attemptwas carried out againstDonald Trumpusing what theUnited States Secret Serviceconfirmed in a report to be an AR-15–style rifle.[113]

Australia[edit]

Following the use of a Colt AR-15 rifle in thePort Arthur massacre,the worstsingle-person shooting incidentin Australian history, the country enacted theNational Firearms Agreementin 1996, restricting the private ownership of semi-automatic rifles, semi-automatic shotguns, and pump action shotguns. (Category D[114]).[115][116][117]

New Zealand[edit]

As a result of theChristchurch mosque shootingswith an AR-15 during Friday Prayer on March 15, 2019, the New Zealand government enacted a law toban semi-automatic center-fire rifles, magazines holding more than 10 rounds, and parts that can be used to assemble prohibited firearms.[118][119]

Canada[edit]

After the2020 Nova Scotia attacks,the deadliest rampage by a single person in Canadian history,[120]Canada banned a class of firearms, including the AR-15.[121][122]

Partial list of models[edit]

See also[edit]

References[edit]

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Further reading[edit]

Wikiquote has quotations related toAR-15 style rifle.
Wikimedia Commons has media related toAR-15.
  • Stevens, R. Blake and Edward C. Ezell (1994).The Black Rifle M16 Retrospective.Ontario, Canada: Collector Grade Publications.ISBN0889351155
  • Bartocci, Christopher R. (2004).Black Rifle II The M16 Into the 21st Century.Ontario, Canada: Collector Grade Publications.ISBN0889353484
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