Product DescriptionThe Sons of Liberty Gun Works 5.56 Bolt Carrier Group is built to serve as a core operating component in AR-15 pattern rifles. Designed to handle the critical cycle of operations including locking, unlocking, extraction, and ejection, this bolt carrier group features a black phosphate finish, a full-auto profile carrier, and a full-auto rated design for dependable performance. The bolt is full-auto test fired at assembly, and the unit is compatible with 5.56 NATO, .300 Blackout, 6MM MAX, and .350 Legend applications.Product Highlights Full-auto rated bolt carrier group engineered for AR-15 platform reliability Black phosphate finish helps provide a durable, classic protective coating Carpenter 158 bolt construction for strength in demanding shooting conditions Full-auto test fired bolt at assembly for added quality assurance Compatible with 5.56 NATO, .300 Blackout, 6MM MAX, and .350 Legend Specs Product Type: Bolt Carrier Group Platform Fit: AR-15 Caliber Compatibility: 5.56 NATO, .300 Blackout, 6MM MAX, .350 Legend Carrier Profile: Full-Auto Profile Rating: Full-Auto Rated Bolt Material: Carpenter 158 Finish: Black Phosphate Assembly Testing: Full-Auto Test Fired Bolt MPN: SOLGWBCG556 UPC: 691821352340 Brand: Sons of Liberty Gun Works Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.