WILSON RCVR KT LOWER SM PRT BLT AR10Wilson 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 detent springs, Safety Detent, Safety Detent Spring, Semi auto Safety