Clone correct mod 1 upper: COLT C MARKED KEYHOLE UPPER 18″ DOUGLAS MK12 SPR SS 1/7 TWIST BARREL MK12 GAS BLOCK MILSPEC GAS TUBE OPS INC LONG COLLAR BRAKE. OPS INC MUZZLE DEVICE. KNIGHTS FF LONG MK12 RAIL. Fairly salty upper that still makes consistent hits at 1k meters with mk262
