Patent ID: 8667727

Claim:
A device for attaching an additional device to a firearm, with a rail ( 2 , 10 ), which can be attached to the firearm, and which exhibits multiple grooves ( 7 ) transverse to the direction of fire, each of which grooves having side surfaces serving as stop surfaces, and a mount assembly ( 1 , 22 , 54 ), including elements ( 8 ) for holding the additional device ( 9 ) and means ( 12 , 13 ) for releasably clamping the assembly ( 1 , 22 , 54 ) onto the rail ( 2 , 10 ), including a recoil lug ( 3 ) dimensioned to fit into a first groove ( 7 ) on the mounting assembly ( 1 , 12 , 13 , 22 , 54 ) and rest against a first stop surface of a first groove ( 7 ), wherein the mount assembly ( 1 , 22 , 54 ) further includes an adjustable stop ( 4 , 19 , 52 ) lying without play against a stop surface ( 50 ) of a further groove ( 7 ) opposite, along the line of fire, to the first stop surface, and wherein the adjustable stop is a pin ( 52 ) urged by the force of a spring ( 53 ) to rest against the stop surface ( 50 ) of the further groove ( 7 ).