The 5.56 AR-Pistol Build Kit from TacFire features a 7.50" contour threaded barrel with A2 bird cage flash hider and black nitride finish. It utilizes a .750 micro, low profile gas block, pistol-length gas tube w/pin, 7" Ultra Slim clamp-on Keymod free-float handguard, and AR15 pistol buffer tube w/foam. The stripped billet upper features nitride BCG, Mil-Spec charging handle with steel latch, dust cover, forward assist, standard receiver end plate, and Mil-Spec & Commercial castle nut. Also includes is a buffer tube spring, buffer, and P-GAR standard A2 pistol grip.