Markings are not visible through the ejection port.
Carrier is marked "BRT" with Logo on the top rear side.
Full Auto Bolt Carrier and Key for the AR Family of Weapons (AR15, M16, M4)
The USGI full auto bolt carrier is Hard Chrome lined inside and Manganese Phosphate coated outside.
The Mil-Spec gas key is chrome lined, secured with mil drawing heavy splined fasteners and properly staked to ensure reliable gas system performance.
100% made in USA to current USGI M4A1 specifications.