US Patent 10545006 Universal mounting device for pistol armrest

A universal mounting device for a pistol having a rear extended connecting extension, wherein the universal mounting device includes a buttstock body having an elongated holding channel for slidably receiving the connecting extension therealong, and a locking mechanism provided at the buttstock body to selectively adjust a diameter size of the holding channel. The locking mechanism is actuated to reduce the diameter size of the holding channel for tightly pressing an inner wall of the holding channel at an outer wall of the connecting extension so as to lock up the connecting extension at the holding channel.