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Patent No. 3,236,155
Title: Firearm Having an Auxiliary Bolt
Closure Mechanism (M16)
Inventor: F.E. Sturtevant

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U.S. Pat. No. 3,236,155 to Sturtevant discloses an improved mechanism to insure the full and positive closure of the bolt assembly of an automatic firearm despite the failure of such assembly to automatically close in the normal fashion. This mechanism is intended for use on automatic firearms such as the M16 rifle having an enclosed reciprocating bolt assembly which must be fully closed in order for the firearm to fire.

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