Sale Quick view Add to Cart Diamondback - DB15, Semi-automatic Rifle, 223 Remington/556NATO, 16" Medium Profile Threaded Barrel, Carbine Length Gas System, 4150CrMov Black Nitride, 1:8RRH Twist Rate, 1/2X28 Thread Pitch, 15" M-LOK Handguard $538.75 $499.99 $700.00 Diamondback Firearms