MDX Arms Premium 8620 Nitride M16 FA BCG
- Carrier: Machined from 8620 steel & QPQ nitride/melonite treated.
Improved carrier geometry with M16 profile. The QPQ nitride/melonite treatment hardends the surface to 70 RC and reduces friction, 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. 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.
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