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