DD Upper, MK18 URG, 556NATO, 10.3" Hammer Forged Barrel , 1:7 Twist, Flat Top, Black Finish 23-004-08013-006

M4 URG, MK18 comes complete with bolt carrier group and charging handle, 10.3 inch forged barrel, RIS II MK18 rail system, and low profile gas block. Chrome-lined barrel chambered in 5.56mm NATO with one in seven inch twist. Mil-Spec heavy phosphate coated. A2 bird cage flash hider. A4 upper receiver with M4 feed ramps. All NFA Rules Apply.