Feed ramp
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Afeed rampis a basic feature of manybreech loadingcartridgefirearmdesigns. It is a tightly machined and polished piece of metal which guides acartridgefrom the top of themagazineinto the firingchamberof thebarrel.The feed ramp may be part of the magazine (AR-7), part of the receiver or frame (Mauser C96), part of the barrel (H&K USP) or part of the barrel nut/locking lugs (AR-15). Some firearms, like theFN Five-seven,have a beveled chamber instead of a feed ramp.
The feed ramp is a critical part ofsemi-automatic firearmsandautomatic firearms.When the weapon is fired and the spent case is ejected, the feed ramp functions to direct a fresh cartridge from the magazine into firing position; that is, the fresh cartridge slides along the feed ramp into battery. The need for the cartridge to slide both forwards and upwards along the feed ramp and into the barrel is the primary design consideration that makes theogivethe preferred shape for all modern automatic pistol rounds (ahollow point bulletis a truncated ogive), as there are many other shapes that are stable in ballistic flight.
A rough surface or the presence of debris on the feed ramp can knock cartridges off-center, inducing ajam.Polishing a feed ramp is among the tasks commonly performed bygunsmiths.
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