Rosco Manufacturing bolt carrier group for 5.56 NATO and 300 Blackout with black phosphate finish, chrome-lined gas key and bolt channel, full-auto rated construction.
This dual-caliber bolt carrier group from Rosco Manufacturing represents a solid choice for shooters who run both 5.56 NATO and 300 Blackout platforms. Built to exacting standards, it delivers the reliability you need in a modern sporting rifle.
A quality bolt carrier group is the heart of your rifle's reliability. Rosco's attention to detail—from the chrome-lined gas key to the matched bolt—means fewer malfunctions and more time doing what you love. Whether you're at the range or in the field, this carrier group delivers consistent performance.