The RB5103 is designed to fit any stock adapter or receiver that uses Mil-Spec style threads and can be used with any Mil-Spec style collapsible stock. Our patented technology absorbs the recoil impulse compressing the buffer 3/4″.  The RB5103 Shotgun Recoil Buffer reduces felt recoil by 70%, improving the shooters overall accuracy and eliminating muzzle flip. Our test data shows that the time to reacquire a target decreases, and in most cases the shooter will not have to leave their scope after taking their shot.