SPIKE'S LPK STANDARD 556 BLK.

Spike's Tactical Lower Receiver Parts Kit Standard, 223 Rem/556NATO, Rounded Hammerand Hammer Spring, Trigger and Trigger Spring, Disconnector and Disconnector Spring, Safety Selector, Detent, Spring, Bolt Catch, Roll Pin, Plunger, Magazine Catch, Trigger Guard, A2 Pistol Grip. Black Finish SLPK101.