CMMG Banshee MK3 8.6 Blackout 12.5" Barrel 20rd M-LOK Handguard

The CMMG Banshee MK3 in 8.6 Blackout delivers subsonic performance in a compact package, engineered for suppressed shooting and close-quarters applications. This pistol-caliber carbine variant bridges the gap between traditional AR platforms and specialized subsonic systems. Built on CMMG's proven radial delayed blowback system, it cycles reliably with both subsonic and supersonic loads without gas system adjustments.

What Makes This Different

Unlike direct impingement systems that struggle with subsonic ammunition, the MK3's radial delayed blowback operates independently of barrel length or suppressor back-pressure. The 8.6 Blackout cartridge provides 300 Blackout ballistics in a shorter case, allowing for heavier projectiles and improved magazine compatibility. Factory testing shows consistent cycling with projectiles ranging from 160 to 350 grains. The system eliminates gas blowback common in suppressed AR-15 platforms.

Key Features

• Radial delayed blowback system cycles reliably with all 8.6 Blackout loads
• 12.5-inch barrel with black nitride finish for corrosion resistance
• 11-inch M-LOK handguard provides 9 attachment points for accessories
• 7075-T6 aluminum receivers machined to mil-spec tolerances
• CMMG Zeroed linear compensator reduces muzzle blast and concussion
• 20-round magazine optimized for 8.6 Blackout cartridge dimensions
• Standard AR-15 controls and ergonomics for familiar operation

Range performance demonstrates sub-2 MOA accuracy with quality ammunition, making it suitable for precision applications within 200 yards. The platform excels in suppressed configurations where the radial delayed system prevents over-gassing issues. Law enforcement agencies report reliable function in adverse conditions, while competitive shooters appreciate the reduced recoil impulse compared to traditional rifle cartridges. The nitride barrel coating extends service life beyond standard phosphate treatments.

Technical Specs

• Caliber: 8.6 Blackout (.338 caliber)
• Barrel Length: 12.5 inches with 1:7 twist rate
• Overall Length: 30.75 inches (estimated with brace extended)
• Handguard: 11-inch M-LOK compatible aluminum
• Receiver Material: 7075-T6 aluminum, Type III anodized
• Operating System: Radial delayed blowback
• Magazine Capacity: 20 rounds
• Thread Pitch: 5/8x24 TPI (standard for .30 caliber suppressors)
• Weight: Approximately 6.8 pounds unloaded
• Made in USA with limited lifetime warranty

This configuration represents the current evolution in subsonic platform design, addressing the limitations of gas-operated systems when running heavy, slow projectiles. Professional users gain a reliable tool that performs consistently across varied ammunition weights and environmental conditions.