Markings are not visible through the ejection port.
Carrier is marked "BRT" with Logo on the top rear side.
CHROME Full Auto Bolt Carrier and Key for the AR Family of Weapons (AR15, M16, M4)
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.
