Alpha Shooting Sports ALPHA Premium 5.56 V2 Bolt Carrier Group BCG QPQ Nitride/Melonite Plated Black

Alpha Shooting Sports ALPHA Premium 5.56 V2 Bolt Carrier Group BCG QPQ Nitride/Melonite Plated Black. Improved carrier geometry with M16 profile. The QPQ nitride/melonite treatment hardens the surface to 70 RC and reduces friction adding corrosion resistance inside and out. Bolt: 9310 & QPQ nitride/melonite treated. Shot peened precision ground diameters. Magnetic particle inspected and laser marked. Extractor machined from S7 tool steel. Crane extractor O ring to boost extraction clamping force. Gas key machined from billet 4140 with grade fasteners and staked to mil spec. Chrome plated firing pin per mil spec. Specifications for Alpha Shooting Sports ALPHA Premium 5.56 Nitride V2 Bolt Carrier Group (BCG): Manufacturer: Alpha Shooting Sports Color: Black Finish: Nitride Fabric/Material: Steel Cartridge: 5.56x45mm NATO Hand: Right Bolt Material: 9310 Steel Carrier Material: 8620 Steel Features of Alpha Shooting Sports ALPHA Premium 5.56 Nitride V2 Bolt Carrier Group BCG Carrier: Machined from 8620 steel QPQ nitride/melonite treated. Improved carrier geometry with M16 profile. The QPQ nitride/melonite treatment hardens the surface to 70 RC and reduces friction adding corrosion resistance inside and out. Bolt: 9310 QPQ nitride/melonite treated. Shot peened precision ground diameters. Magnetic particle inspected and laser marked. Extractor machined from S7 tool steel. Crane extractor O ring to boost extraction clamping force. Gas key machined from billet 4140 with grade fasteners and staked to mil spec. Chrome plated firing pin per mil spec. Package Contents: Alpha Shooting Sports ALPHA Premium 5.56 Nitride V2 Bolt Carrier Group Alpha Shooting Sports MELBCGPv2: ALPHA Premium 5.56 V2 Bolt Carrier Group QPQ Nitride/Melonite Plated Black