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forward assist
Forward assisting is the practice of moving the bolt or bolt carrier of a weapon fully forward when the return spring has not done so (or there is a chance that it will not have done so). Some weapons have a dedicated device to allow forward assisting; on others it is simply a procedure performed on the cocking handle.
==As a device==
The forward assist on a firearm is a button found commonly on AR-15 rifle derivatives, such as the M16 rifle, and is usually located near the bolt closure. When hit, it pushes the bolt carrier forward, ensuring that the bolt is locked. In order to ensure that the extractor is clipped around the rim of the casing, the forward assist is usually struck rather than pushed. It is commonly incorporated into standard loading procedure to prepare a weapon for firing, or to close the bolt when the weapon is excessively dirty. It can also be used to close a bolt that was gently let down, rather than released under full spring compression, to keep the noise of closing the bolt to a minimum.
Another instance where the forward assist can prove useful is when performing a stealth chamber check. Rather than letting the bolt go forward under full spring tension after verifying a round is in the chamber, the bolt can be let forward gently and then the forward assist can be used to fully close the bolt. Doing so will produce a very discreet "click" rather than the loud sound of the bolt slamming forward.
The forward assist had been implemented in 2007 on the MSAR STG-556, an American-made clone of the Austrian Steyr AUG assault rifle, but the usefulness of such device is questionable, since the design is not normally prone to the malfunction that led to the need of the forward assist in other firearms; in fact ''Microtech Small Arms Research Inc.'', the manufacturer of the STG-556, has dropped the forward assist on all rifles manufactured since November 2008.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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