ACCUWEDGE for the AR15 or M16 receivers. The Accu Wedge Instantly ,Tightens Loose Upper and Lower Receivers. Helps promote better accuracy by making the upper and lower receivers fit tighter. Open upper receiver; drop this long-wearing, rubber wedge into the rear of the lower, behind the push pin. Absolutely no modification required. Made in USA.

• Fits Near Your Takedown Pin & Keeps the Upper Section Snug and Tight Against the Lower
• Increases Accuracy, Decreases Vibration and Prevents Wear