Angstadt Arms AA09BCGNIT 9mm Bolt Carrier Assembly QPQ Nitride AR-15

The Angstadt Arms AA09BCGNIT Bolt Carrier Assembly transforms standard AR-15 platforms into reliable 9mm carbines with precision-machined components built for consistent cycling. This bolt carrier group features QPQ black nitride treatment on 8620 steel construction for enhanced durability and corrosion resistance. The assembly provides the critical interface between upper and lower receivers in 9mm AR-style builds.

What Makes This Different

Unlike standard 5.56 bolt carrier groups, this assembly incorporates specific geometry and mass distribution optimized for 9mm cartridge dimensions and operating pressures. The QPQ nitride surface treatment penetrates deeper than standard coatings, creating a harder surface layer that resists wear and fouling buildup. The 8620 steel composition provides superior strength-to-weight ratios compared to standard carbon steel alternatives while maintaining proper headspace tolerances.

Key Features

• QPQ black nitride finish provides 70 HRC surface hardness for extended service life
• 8620 alloy steel construction offers enhanced tensile strength and impact resistance
• Precision-machined bolt face accommodates 9mm cartridge rim dimensions
• Compatible with standard AR-15 upper receivers and charging handles
• Proper mass distribution ensures reliable cycling with various 9mm loads
• Mil-spec dimensions maintain consistent lockup and timing
• Reduced friction coating minimizes maintenance requirements

This bolt carrier assembly maintains consistent extraction and ejection patterns across different 9mm ammunition weights and velocities. The nitride treatment reduces friction coefficients while increasing surface hardness, resulting in smoother operation and extended maintenance intervals. Competition shooters benefit from the consistent timing and reliable cycling, while duty applications gain from the enhanced corrosion resistance and durability under adverse conditions.

Technical Specs

• Caliber: 9mm Luger/9x19mm
• Material: 8620 alloy steel
• Finish: QPQ black nitride
• Platform: AR-15 compatible
• Surface hardness: 70 HRC
• Weight: Optimized for 9mm cycling
• Manufacturer: Angstadt Arms
• Model: AA09BCGNIT

The AA09BCGNIT represents proven engineering specifically developed for 9mm AR conversions rather than adapted rifle components. This purpose-built approach eliminates common cycling issues associated with modified 5.56 bolt carriers. The combination of premium materials and specialized manufacturing delivers the reliability required for both recreational and professional applications.