Firearm with reciprocating bolt assembly

摘要: A semiautomatic firearm with a reciprocating bolt assembly has delayed blowback and firing pin block. The is particularly suitable for necked rimfire cartridges high level of reliability. Features prevent out-of-battery firing, when the not fully engaged to chamber or barrel face, movable member within body functions as blocking that blocks prevents from striking cartridge. In embodiments, two stop portions can engage depending on cycle status firearm. reverse cam mechanism associated provides resistance delays blowback. may interface cartridge using undercut engagement forward end bolt. also incorporate one both dual trigger arrangement part mechanism.