Doublestar Corp. AR15 Lower Parts Kit, 223 Rem/556NATO, Black Finish, Includes Fire Control Group, Fire Control Group Pins and Springs, Bolt Catch Assembly, Magazine Catch Assembly, Front Pivot Pin, Rear Takedown Pin, Takedown Springs (2), Takedown Detents (2), Trigger Guard Pin, Pistol Grip, Screw and Washer, Buffer Detent, Buffer Detent Spring AR270