Anderson Complete AR Lower Parts Kit SS Trigger - The Lower Parts Kit for AM-15 includes the following: Bolt Catch, Bolt Catch Plunger, Bolt Catch Roll Pin, Bolt Catch Spring, Buffer Retainer, Buffer Retainer Spring, Disconnect, Disconnect Spring, Stainless Steel Hammer, Hammer Pin, Hammer Spring, Magazine Catch, Magazine Catch Button, Magazine Catch Spring, Pistol Grip (A2 style), Pistol Grip Lock Washer, Pistol Grip Screw, Pivot Pin, Pivot Pin Detent, Pivot Pin Detent Spring, Selector, Selector Detent, Selector Detent Spring, Takedown Pin, Takedown Pin Detent, Takedown Pin, Detent Spring, Stainless Steel Trigger, Trigger Guard, Trigger Guard Roll Pin, Trigger Pin, Trigger Spring