This wedge will instantly tighten loose upper & lower receivers. Fits near the take down pin and keeps the upper receiver snug and tight against the lower receiver. Works by keeping tension on the rear take down pin. This product helps promote better accuracy by making the upper and lower receiver fit tighter and will also decrease vibration and prevent wear.
Easy installation. Just open your upper receiver and drop this rubber wedge into the rear of the lower receiver behind the rear takedown pin.