This Nylon Tipped Tension Set Screw allows users to fine tune the fit of their upper with our Gen 2 Lower Receivers. Achieve a tight fit with any standard AR15 upper receiver by inserting the screw into the grip tang of our Gen 2 Lower Receiver and tightening against the upper receiver until there is no wobble between the 2 parts.

NOTE:  All of the Aero Gen 2 AR15 and M5 Lower Receivers come with this screw pre-installed.