M16a1 20'''' Rifle Length Upper W/Colt Ar-15 4x21mm - Brn-16a1 5.56x45 Nato 20'''' Bbl 1-7 Twist Upper W/Colt 4x21mm

The BRN-16A1A(R) Complete Upper Receivers are back! Styled after the issued U.S. M16A1, the BRN-16A1A(R) has distinct features, found on late 1960s M16 rifles. The muzzle of the BRN16A1A(R), is capped by the classic A1 flash hider, with ports around its radius, and is retained by a proper split washer. The flash hider is attached to a lightweight 20 inch barrel, found on AR-15 variants through the M16A1. Available with a 1-12 or 1-7 twist. Select 1-12 if shooting 55gr bullets, and 1-7 if shoo