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The Aero Precision AR-15 Gen 2 Stripped Lower Receiver is the perfect starting point for your next AR build. Machined from 7075-T6 aluminum with a hard-coat anodized finish, the Gen 2 works with standard AR-15 components for easy assembly and fit. Aero Precision Gen 2 enhancements have been integrated into the Gen 2 lower. The rear takedown pin detent hole has been threaded for a 4-40 set screw and an upper tension screw has been placed in the grip tang. The Upper Tension Screw allows you to reduce the play between the upper and lower. The magazine well has an increased flare for smoother insertion of the magazine. For your next precision AR build make sure you use Aero Precision.