CMMG Lower Parts Kit Includes:? A2 Pistol Grip ? Pistol Grip Screw ? Pistol Grip Lock Washer ? Bolt Catch Lug ? Bolt Catch Plunger ? Bolt Catch Roll Pin ? Bolt Catch Spring ? Buffer Retainer Pin ? Buffer Retainer Spring ? Two Pivot/Takedown Detent Pins ? Two Pivot/Takedown Detent Springs ? Rear Takedown Push Pin ? AR-15 Small Front Push Pivot Pin ? Trigger Guard Assy. (Alloy) ? Trigger Guard Roll Pin ? Trigger & Hammer Pins ? Magazine Catch Assembly ? Magazine Catch Spring ? Magazine Release Button ? Safety Semi-Auto Selector ? Safety Selector Detent Pin? Safety Selector Detent Spring ? Semi-Auto Disconnector ? Trigger Disconnector Spring ? Semi-Auto Hammer (notched) ? Hammer Spring ? Semi-Auto Trigger? Trigger Spring