CHROME Full Auto Bolt Carrier Group BCG for the AR Family of Weapons (AR15, M16, M4)
Carpenter 158 bolt is Shot Peened, HP tested / MP inspected and plated with Thin Dense Chrome TDC for enhanced fatigue life.
The USGI full auto bolt carrier is Hard Chromed outside and inside.
The Mil-Spec gas key is full Chrome, secured with mil drawing heavy splined fasteners and properly staked to ensure reliable gas system performance.
Bolt is marked "MP". Carrier is marked "BRT" with Logo on the ejection port side.
100% made in USA to USGI M16 specifications.