Finish your AR-15 lower receiver with this Aero Precision Complete Lower Parts Kit with Magpul MOE pistol grip and a Mil-Spec trigger group. This AR-15 LPK comes with everything you need to finish a Mil-Spec lower but includes a 4-40 set screw for use with the threaded takedown pin detent hole present on most Aero Precision lowers. This makes it extremely easy to install the spring and detent without need to use the end plate to capture it. Also included is a Magpul MOE polymer trigger guard.