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Failure to feed (FTF) is when a firearm fails to feed the next round into the firing chamber. Failure to feed is common when the shooter does not hold the firearm firmly (known as limp wristing), when the slide is not fully cycled by the preceding round, or due to problems with the magazine. It can also be caused by worn recoil springs, buffer ...
A double feed in itself is somewhat uncommon as an independent malfunction, but it often manifests itself as a consequence of other firearm malfunctions. A controlled feed mechanism should in theory not be able to double feed if it is set up correctly. In practice, however, double feed malfunctions sometimes also occur with controlled feed ...
Tap, rack, bang (TRB) or tap, rack, and go (TRG) is jargon for the response to a failure to fire in a firearm with a removable magazine. [1] This is designated as an "Immediate Action" and involves no investigation of the cause (due to being under fire in a combat or defensive situation), but is effective for common failures, such as defective or improperly seated ammunition magazines.
Dual-feed has been used to describe firearms which either can switch between two different feeding mechanisms [1] or employ a feeding mechanism two times simultaneously. [ 2 ] Firearms feeding from ammunition belt or box magazine
Depending on the operating mechanism, there are a number of places that limp wristing can cause a failure to cycle. Recoil operated firearms are more susceptible to failure of this type than blowback and gas-operated firearms, and lightweight polymer framed handguns are more susceptible than heavy, steel-framed or even lighter metal alloy handguns.
In a single-feed design the top cartridge touches both lips and is commonly used in single-column box magazines, while a staggered feed magazine (sometimes called "double-feed" magazine, not to be confused with the firearm malfunction) consists of a wider set of lips so that the second cartridge in line forces the top cartridge against one of ...
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Unlike the double-column, staggered-feed magazine found on the Thompson M1921/1928 variants, the MP 40 uses a double-column, single-feed version. [15] The single-feed insert resulted in increased friction against the remaining cartridges moving upwards towards the feed lips, occasionally resulting in feed failures; this problem was exacerbated ...