Complete Sharps Bros SBUR04 upper with 15" full top rail handguard. 16" AR15 Upper, 5.56 CAL, 15" Handguard, M16 black DLC coated BCG, Radian Charging Handle, Mid Length Gas System. Full Top Rail. MLOK 7 sides. Total Weight of complete upper (including BCG and charging handle): 4lbs, 3.3 ounces. Additional Barrel Specs: 100% US Made from 4150 CMV Material. 29 ounces. 1:7 RH Twist. Gas Block Journal: .75". 1/2-28 barrel thread. Black Nitride finish. M4 Barrel Extension. Mfg: Sharps Bros
