Brownells Bolt Carrier Group .223 Remington/5.56x45mm, Chrome/Black

Introducing the enhanced BRN-4 bolt carrier group, now available with a sleek chrome bolt and a robust manganese phosphate carrier. This upgraded version is an ideal enhancement for any BRN-4 setup or as a reliable replacement for MR556 or 416 rifles. The chrome bolt and cam pin not only provide a visually appealing finish but also simplify the cleaning process, ensuring your firearm remains in top condition. The extractor, finished with phosphate, offers a superior grip on brass casings, guaranteeing consistent and dependable extraction with every shot. Engineered for durability, the phosphate carrier is specially hardened to withstand the rigors of extreme firing schedules, including sustained full-auto fire. The carrier's tail is thoughtfully enlarged to prevent tilting from piston impact, ensuring smooth and reliable operation. Designed as a full-length M16 type carrier, it features the MR556 cutout, ensuring seamless compatibility with MR556 and 416 upper receivers. Elevate your firearm's performance and reliability with this meticulously crafted bolt carrier group, designed for enthusiasts who demand the best.8620 steel carrier with manganese phosphate finish9310 steel bolt - chrome finish4340 steel extractor with manganese phosphate finishEjector made from S7 tool steel with a manganese phosphate finishFiring pin, 8740 steel - chrome finishExtractor spring featuring a black insertBlack type extractor O-ringDeleteFiring pin retaining pin