Alpha Nitride .224 Valkyrie / 6.8 SPC 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 Shot peened precision ground diameters. Magnetic particle inspected and laser marked. Extractor machined from 4140 hardned steel. Gas key: Machined from billet 4140 with grade fasteners and staked to mil spec. Chrome plated firing pin per mil spec.