AR-15 lower receiver parts kit Includes everything that goes inside your stripped lower receiver. OEM Colts Manufacturing Includes fire control group, Hammer, Trigger, Safety Selector, Disconnect, the pins and springs for the fire control group, bolt catch assy with upgraded Coil Pin, mag catch assy., front pivot pin, rear take down pin, 3 take down pin springs, 3 take down pin detents, Colt A-2 pistol grip ( circle 4 mark ),  Stainless Steel 1 1/8in pistol grip screw, pistol grip screw lock washer, buffer detent,buffer detent spring, and trigger guard with upgraded coil pin.