Great Lakes Firearms AR-15 Bolt Carrier Group .223/5.56mm/.300 AAC Blackout

The Great Lakes Firearms AR-15 Bolt Carrier Group (MPN 556BCG) is a drop-in BCG built for the AR-15 platform. Sized to standard AR-15 dimensions, this carrier is designed to run .223 Remington, 5.56 NATO, and .300 AAC Blackout interchangeably, giving builders one component that covers a standard 5.56-chambered rifle as well as a .300 BLK build.

The BCG is machined from steel and finished in black, with an overall weight of approximately 0.8 lbs. It installs into any standard AR-15 upper receiver, making it a direct-fit option for new builds, replacement duty, or as a spare carrier to keep on the bench.

Whether you are assembling a fresh AR-15 or refreshing a worn carrier, the Great Lakes Firearms BCG delivers a versatile, multi-caliber solution for the AR platform at a value-minded price point.