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 Double Star uses only the best parts to make their lower parts kits. The fire control group is made from mil spec heat treated 8620 steel and finished on all touch points for a smooth" crisp trigger pull with minimal creep or drag. This AR15 lower parts kit uses high quality American made parts to ensure performance in your AR15.