The Nylon Tension Screw allows users to fine tune the fit of their upper with our Lower Receivers. Achieve a tight fit with any standard AR15 upper receiver by inserting the screw into the grip tang of our Lower Receiver and tightening against the upper receiver until there is no wobble between the 2 parts.
NOTE: This is a replacement tension screw. All of our Lower Receivers come with this screw pre-installed. 2 per Pack.