Complete Enhanced Lower Parts Kit with Magpul Grip includes: Bolt Catch, Bolt Catch Plunger, Bolt Catch Roll Pin, Bolt Catch Spring B.A.D Lever Battery Assist Device AR15/M4 Buffer Retainer, Buffer Retainer Spring Disconnect, Disconnect Spring Hammer Pin, Hammer Spring Magazine Catch, Magazine Catch Button, Magazine Catch Spring Pistol Grip (Magpul MOE), Pistol Grip Lock Washer, Pistol Grip Screw Pivot Pin, Pivot Pin Detent, Pivot Pin Detent Spring Ambi Safety Selector, Selector Detent, Selector Detent Spring Takedown Pin, Takedown Pin Detent, Takedown Pin, Detent Spring Magpul Enhanced Trigger Guard, Trigger Guard Roll Pin, Trigger Pin, Trigger Spring.