F OP Exclusive Moriarti AR-15 Pencil Upper Receiver Assembly, 5.56x45mm NATO, 16in, Mid, M-LOK, 1-7 Twist, 1/2x28 Thread, Diamond Cut Free-Float Handgrd, Tri Port Muzzle Brake, Black, MAR-5.56-16-12-TRI $285.18 MAR5561612TRI - Dvor