BCA's Bolt Carrier Groups arrive MPI inspected. Perfect for your next .450 Bushmaster or .458 SOCOM AR-15 Build. Specifications:Brand: Bear Creek ArsenalCaliber / Guage: .450 / .458Carrier Style: StandardPlatform: AR-15Bolt Finish: ParkerizedBolt Material: 9310 SteelCarrier Finish: Black NitrideGas Key: StakedMagnetic Particle Inspection: Yes
