Aero's 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. Aero's 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 or trigger guard. Includes: Takedown/pivot Springs Takedown/pivot detents Takedown pin Pivot pin Bolt Catch Bolt Catch Spring Bolt Catch buffer Safety Selector Safety Selector spring Safety Selector detent 4-40 Set Screw (for threade Mfg: Aero Precision
