SMALL ARMS Russian patent published in 2010 - IPC F41A5/08 

FIELD: weapons and ammunition.

SUBSTANCE: arms include barrel receiver and movable spring-loaded barrel in direction of recoil/run-up, in the breech piece of which there are action supports. Arms include spring-loaded bolt carrier assembly with bolt, which has the possibility of axial movement and is installed in barrel receiver. Bolt includes reciprocal action supports and pin which interacts with spiral slot on bolt carrier assembly. The latter includes closed spiral slot in which there is the pin of the bolt which projects beyond the perimetre of the bolt carrier assembly. Upper wall of barrel receiver includes tracer template with spiral surface, which has the possibility of interacting with projection part of the barrel pin at barrel recoil. Spiral surfaces on tracer template and in bolt carrier assembly are of opposite direction. Upper inner wall of barrel receiver includes the guide plank with possibility of interacting with the bolt pin at recoil/run-up of the bolt carrier assembly with bolt.

EFFECT: simplifying the arms design at providing operability in all operating conditions.

5 dwg