Shoot your favorite caliber in an AR-15 platform with this 7.62x39/12.7x42 bolt carrier group! Bear Creek Arsenal's 7.62x39/12.7x42 bolt carrier groups (BCGs) are Magnetic Particle Inspected (MPI) to ensure high performance. BCA's 7.62x39/12.7x42 BCG is made with durable 9310 Steel and compatible with all rear charging 7.62x39/12.7x42 uppers; the gas key is also staked from the side for enhanced durability. Our 7.62x39/12.7x42 bolt carrier groups feature an enhanced extractor for increased durability when firing steel case ammunition. Featuring a 7.62x39 enhanced firing pin for increased reliability for steel cased ammo and upgraded bolt. Use a Bear Creek Arsenal BCG for your next AR-15 build and experience high performance at a lower cost! Specifications Brand: Bear Creek ArsenalCaliber / Gauge: 7.62x39/12.7x42Carrier Style: StandardPlatform: AR-15 Bolt Finish: Parkerized Bolt Material: 9310 Steel Carrier Finish: Black NitrideGas Key: Staked from the side for increased longevityMagnetic Particle Inspection: Yes {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}