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.This lower parts kit does not include the fire control group, pistol grip, magazine catch parts, or trigger guard.Includes: Takedown/pivot Springs Takedown/pivot detents 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 springSpecifications: Made In America? Yes Platform Multi Weight(s) 1.6 oz