Wilson Combat Small Parts Kit - Fits Wilson Combat AR10 Billet Receiver - Black - Includes - Wilson Combat Bullet Proof Bolt Release WC-10 - Bolt Catch Screw for WC-10 Billet Lower - Bolt Catch Plunger - Bolt Catch Roll Pin - Bolt Catch Spring - Magazine Catch - Magazine Catch Spring - Magazine Catch Button - WC-10 Pivot Pin - WC-10 Takedown pin - 2x Pivot/Takedown detents - 2x Pivot/Takedown dete