Patent ID: 7866078

Claim:
An adjustable locking device for locking and adjusting the assembly tension between a stock ( 20 ) and a frame ( 12 ) of a firearm ( 10 ), characterised in that said adjustable locking device comprises a stirrup ( 50 ) connected by a hinging pin ( 41 ) to the stock ( 20 ) where said stirrup ( 50 ) is provided with a contact profile ( 51 ) and said stirrup ( 50 ) is adapted to be commanded in rotation around a said hinging pin ( 41 ), said stirrup having an engagement portion ( 53 ) in the form of a fork ( 54 ) adapted to cooperate with a stock bolt ( 16 ) connected to the receiver ( 12 ), said contact profile ( 51 ) being adapted to receive a thrust from a screw ( 60 ) that causes said stirrup ( 50 ) to rotate around hinging pin ( 41 ), from an unlocked position of the stirrup ( 50 ) to an engagement position of said stirrup ( 50 ) on the stock bolt ( 16 ) wherein the tension between the stirrup ( 50 ) and the stock bolt ( 16 ) is increased by the rotation of the stirrup, and when the thrust from screw ( 60 ) is reversed, to rotate from the engagement position where said stirrup ( 50 ) is in tension with said stock bolt ( 16 ) to the unlocked position.