F Radian Weapons Model 1 Complete Upper Receiver, .300 AAC Blackout, 9 in Barrel, Custom, Pistol Length, 1-5 Twist, 1/2x28 Thread, M-LOK, Deadair Flash Hider, FDE, R0445 $1,829.95 R0445 show more like this Free Shipping on most orders over $49 Optics Planet