BCA's Bolt carrier groups are MPI inspected. Perfect for your next .308/.243/6.5 Creedmoor Rear Charging AR-10 build. Specifications: Brand: Bear Creek Arsenal Caliber / Gauge: .308 / 6.5 Creedmoor / .243 Winchester / .22-250 Carrier Style: Standard Platform: AR-10 Bolt Finish: Parkerized Bolt Material: 9310 Steel Carrier Finish: Black Nitride Gas Key: Staked Magnetic Particle Inspection: Yes {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}} It is the responsibility of the consumer to ensure all state, local, federal, and ITAR regulations are followed