Bear Creek Arsenal's 6.5 Grendel bolt carrier groups (BCGs) are Magnetic Particle Inspected (MPI) to ensure high performance. BCA's 6.5 Grendel BCG is made with durable 9310 Steel and compatible with all Rear Charging 6.5 Grendel uppers; the gas key is also staked from the side for enhanced durability. 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 6.5 GrendelCarrier Style StandardPlatform AR-15 Bolt Finish ParkerizedBolt Material 9310 Steel Carrier Finish Black NitrideGas Key Staked Magnetic Particle Inspection Yes {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}