Product Description The Sons of Liberty Gun Works (SOLGW) Bolt Carrier Group is built to be the driving core of your AR platformthe component responsible for locking, unlocking, extracting, and ejecting during every cycle of operation. This full-auto rated bolt carrier group features a precision-machined bolt made from Carpenter Technology No. 158 chrome-nickel alloy and a carrier machined from AISI 8620 aircraft-quality alloy. Finished in a durable manganese phosphate and marked with the SOLGW Battle Flag logo deep laser engraving, it is designed for dependable performance in demanding use. Product Highlights Full-auto rated and profiled bolt carrier group for AR-15/AR platform rifles Precision-machined Carpenter 158 bolt for strength and long-term durability AISI 8620 aircraft-quality carrier construction for reliable cycling Durable manganese phosphate (black phosphate) finish for wear and corrosion resistance SOLGW Battle Flag logo deep laser engraved for authentic identification Specs Brand: Sons of Liberty Gun Works Manufacturer Part Number: SOLGWBCG556 UPC: 691821352340 Product Type: Bolt Carrier Group Platform / Fit: AR-15 / AR Platform Rating: Full Auto Rated Bolt Material: Carpenter Technology No. 158 chrome-nickel alloy Carrier Material: AISI 8620 aircraft quality alloy Finish: Manganese Phosphate (Black Phosphate) Caliber: 5.56x45mm NATO 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 products manufacturer.