Our EPC Lower Receivers include the proprietary parts pre-installed from the factory. Other parts and components for assembling your lower receiver are standard AR15 compatible parts. Our EPC Lower Parts Kits include just the parts you need for assembling your EPC Lower Receiver and nothing else.Includes: Takedown/pivot Spring Takedown/pivot detent Hardened trigger/hammer pins Takedown pin Pivot pin Bolt Catch Bolt Catch Spring Bolt Catch buffer Bolt catch roll pin Safety Selector Safety Selector spring Safety Selector detent 4-40 Set Screw (for threaded takedown pin detent hole) Buffer retainer Buffer retainer spring Magpul MOE(R) grip Pistol grip screw Trigger spring Hammer spring Disconnector spring Hammer Trigger DisconnectorSpecifications: Made In America? Yes Platform Multi Weight(s) 6.9 oz