Rock River Arms LAR-15M 300 Blackout 10.5" Pistol SB3 Brace

The Rock River Arms LAR-15M in 300 AAC Blackout delivers compact firepower with the versatility of subsonic and supersonic ammunition compatibility. This 10.5-inch barrel configuration maximizes the 300 Blackout cartridge's ballistic efficiency while maintaining maneuverability in confined spaces.

What Makes This Different

Rock River Arms builds this LAR-15M with their proven manufacturing standards that have supplied military and law enforcement agencies for decades. The 10.5-inch barrel length represents the optimal balance for 300 Blackout performance, providing complete powder burn while keeping overall length manageable. The SB3 stabilizing brace offers shoulder contact for improved accuracy without NFA classification requirements.

Key Features

• 10.5-inch chrome-lined barrel optimized for 300 AAC Blackout ballistics
• SB Tactical SB3 adjustable stabilizing brace with multiple length positions
• Rock River Arms forged upper and lower receivers with Type III hard coat anodizing
• Mid-length gas system reduces felt recoil and improves reliability
• Standard AR-15 magazine compatibility accepts 5.56/.223 and 300 Blackout magazines
• Picatinny rail system accommodates optics, lights, and accessories
• Single-stage trigger assembly with standard AR-15 specifications

The 300 Blackout chambering excels in suppressed applications while maintaining effectiveness with standard ammunition. This barrel length achieves full velocity potential from both 110-grain supersonic and 220-grain subsonic loads. The platform functions reliably across temperature extremes and maintains accuracy standards suitable for precision applications within effective range.

Technical Specs

• Caliber: 300 AAC Blackout (.300 BLK)
• Barrel Length: 10.5 inches, chrome-lined bore
• Overall Length: 26.5-29.5 inches (brace collapsed/extended)
• Weight: Approximately 6.2 pounds
• Gas System: Mid-length with low-profile gas block
• Twist Rate: 1:8 inches for optimal bullet stabilization
• Upper/Lower: Forged 7075-T6 aluminum with hard coat anodizing
• Brace: SB Tactical SB3 with adjustable length of pull
• Thread Pitch: 5/8-24 TPI for suppressor compatibility
• Made in USA with limited lifetime warranty

Rock River Arms' quality control processes ensure consistent performance across their production line. The LAR-15M platform provides the reliability expected from professional-grade firearms while offering the modularity that makes the AR-15 system the preferred choice for multiple applications.