The KynSHOT RB5100 Recoil Buffer is designed to fit any stock adapter or receiver that uses Mil-Spec style threads, making it compatible with any Mil-Spec style collapsible stock. This recoil buffer technology absorbs the recoil impulse, compressing the buffer by 3/4 inch. The Shotgun Recoil Buffer reduces felt recoil by up to 90%, improving the shooter's overall accuracy and eliminating muzzle flip.