Engineered specifically for the demands of the 6mm ARC cartridge, this San Tan Tactical Bolt Carrier Group optimizes extractor geometry and bolt face tolerances for high-velocity, long-range precision shooting. Treated with a Black Nitride (QPQ) salt-bath finish, the metal surface is hardened internally and externally to increase slickness, resist carbon fouling, and protect against barrel gas erosion. It provides smooth, positive feeding and extraction required to squeeze maximum performance out of precision 6mm ARC rifles. It drastically reduces receiver wear, operates reliably in extreme environments with minimal oil, and makes maintenance effortless, as carbon wipe-off requires no harsh solvents or scrapers.

• Optimized Specifically for 6mm Arc Chamberings
• Deep QPQ Black Nitride Finish for Extreme Surface Hardness and Corrosion Resistance
• Enhanced Extractor and Bolt Face Engineering for Reliable Case Feeding/Ejection
• Smooth Low-friction Cycling
• Ideal for Precision, Long-range, and Match Ar-15 Builds

Specifications:
Journal Diameter: .750 Inches
Type: Adjustable Low-Profile Gas Block
Material: High-Strength Alloy Steel
Finish: Black Nitride (QPQ) / Melonite Coating
Attachment Type: Dual Set Screw (Bottom Mount)
Adjustment Mechanism: Front-Access Gas Metering Adjustment Screw
Platform: AR-15 / AR-10 (Fits standard .750 gas block seats)