Aero Precision APAR620558: The Aero Precision EPC-9 Complete Lower Receiver is the perfect base for your custom AR9 build. This complete lower is upgraded to include a Magpul MOEA(R) Grip and MOE SLA(R) Carbine Stock. Includes: EPC-9 Lower Receiver Magpul MOEA(R) Grip Magpul MOE SLA(R) Carbine Stock Lower Parts Kit Enhanced Buffer Tube EPC 7.7oz Buffer M5 Carbine Buffer Spring Castle nut/end plate These parts are installed EPC-9 Lower Receiver Features: Threaded bolt catch pin for easy installation Integrated enlarged trigger guard to remove any risk of breaking off trigger guard tabs, and provide an overall more rugged platform to build on Threaded takedown pin detent recess to allow for the installation of a detent and spring with a single 4-40 set screw Flared magazine well for quick and easy reloads Proprietary components pre-installed from the factory Standard AR15 takedown/pivot pin lug pattern Machined from custom forged 7075-T6 aluminum Compatible with standard frame GLOCKA(R) magazines