Patent ID: 7467581

Claim:
Semi-automatic rifle comprising a frame ( 2 ); a barrel ( 3 ); a first sliding guide ( 9 ) mounted in the frame ( 2 ) and connected rigidly with breech bolts ( 10 ) arranged to enable control of the recocking and the locking of the rifle ( 1 ); an automatic recock device ( 12 ) comprising a piston ( 13 ) mounted in a gas cylinder ( 14 ) whose chamber ( 15 ) is connected to the bore ( 7 ) of the barrel ( 3 ) via a vent hole ( 16 ), wherein the piston ( 13 ) makes contact with the head of a second sliding guide ( 17 ) which is connected to the first sliding guide ( 9 ) and which is mounted in a sliding manner on a guiding rod ( 19 ) which is rigidly connected with the frame ( 2 ) and which extends mainly parallel to the axis of the barrel ( 3 ); a floating mass ( 25 ) through which the guiding rod ( 19 ) passes and which is mounted in a sliding manner in the axial direction of the guiding rod ( 19 ) between two sides ( 27 , 28 ) of a housing ( 24 ) in the head of the second sliding guide ( 17 ); and a return spring ( 29 ) mounted round the guiding rod ( 19 ) and situated between the frame ( 2 ) and the floating mass ( 25 ), and wherein the head of the second sliding guide ( 17 ) is at least partially made of shock resistant thermoplastic material.