Black River Tactical CHROME Full Auto Bolt Carrier Group (AR15, M16, M4)
Carpenter 158 bolt
HP tested / MP inspected
Chrome plated for enhanced service life.
The USGI full auto bolt carrier is Hard Chromed outside and inside.
The Mil-Spec gas key is full Chrome, secured with heavy splined fasteners (per mil-spec drawing) and properly staked to ensure reliable gas system performance.
Bolt is marked "MP". Carrier is marked "BRT" with Logo on the top rear side. Markings are not visible through the ejection port.
100% Made In USA to USGI M16 specifications.