Sons of Liberty Gun Works Scalper Bolt Carrier Group Features The Sons of Liberty Gun Works Scalper Bolt Carrier Group is built around the idea that the BCG drives everything that happens in an AR-15 s cycle of operations from locking and unlocking to extraction and ejection. Every carrier is full-auto test fired at assembly a step that verifies the bolt and carrier function correctly together before the part ever ships giving buyers confidence in its reliability. The full-auto carrier profile adds mass compared to a standard semi-auto carrier which helps smooth out the cycling impulse and can reduce felt recoil particularly on suppressed rifles or those running a gas system tuned for a range of ammunition. Compatible with 5.56 NATO and .300 AAC Blackout the Scalper BCG covers two of the most popular AR-15 chamberings in a single part. A phosphate finish coats the carrier for corrosion resistance and reduced friction during cycling a traditional and proven treatment for AR-15 bolt carrier groups. The black exterior finish keeps the BCG visually consistent with most AR builds while standing up to the heat and fouling generated during extended firing sessions. Sons of Liberty Gun Works treats the bolt carrier group as a critical reliability component rather than a commodity part reflecting that philosophy in their testing and material choices. For AR-15 owners chambered in 5.56 or .300 Blackout who want a verified full-auto profile BCG the Scalper is available for sale at GrabAGun. Sons Of Liberty Gun Works Scalper Bolt Carrier Group Specifications Manufacturer: Sons Of Liberty Gun Works Model: Scalper Bolt Carrier Group Compatible Hosts: AR-15 Type: Bolt Carrier Group Color: Black Finish: Phosphate Carrier Profile: Full-Auto Caliber: 5.56 Available At: GrabAGun