Premium Nitride 5.56 Bolt Carrier Group

Premium Nitride 5.56 Bolt Carrier Group

Features:

• 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 as well as adding corrosion resistance inside and out.
• Bolt:  9310 & QPQ nitride/melonite treated with additional cryo freeze for extra strength.  Shot peened precision ground diameters.
• Magnetic particle inspected and laser marked.
• Extractors:  Aircraft quality alloy steel shot peened with crane extractor O ring installed.
• Gas Key:  Machined from billet 4140 with grade fasteners and staked to mil spec.
• Chrome plated firing pin per mil spec.