This BCA AR-15 complete .223 Wylde rifle has a 16" M4 contour barrel with a parkerized finish, and features a 1:8 twist rate, with a carbine length gas system. It includes the BCA Talon 15" MLOK split rail, an M4 flat-top forged upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. This .223 Wylde complete rifle features a BCA mil-spec AR-15 lower. Barrel Finish : Parkerized Material : 4150 Chrome Moly Vanadium Thread Pitch : 1/2 x 28