18" 6MM Arc 1:8 Twist Barrel

Unlock the maximum ballistics of the revolutionary 6mm ARC cartridge with the 18" 6mm ARC Heavy Profile AR-15 Barrel. Designed for precision marksmen, competition shooters, and long-range hunters, this 18-inch setup provides the ideal sweet spot between velocity, maneuverability, and heat dissipation for modern sporting rifles.

Machined from premium 4150 Chrome Moly Vanadium (CMV) steel, this barrel features a Heavy Barrel Profile that significantly reduces harmonic vibration and resists thermal drift during rapid or extended fire sessions. To ensure flawless round stripping and feeding, it is engineered with .300 Blackout style feed ramps, providing superior reliability over standard feed ramp geometries when cycling high-BC 6mm projectiles.

The fast 1:8 right-hand twist rate is perfectly tuned to stabilize popular heavy 6mm ARC bullets for ultra-flat trajectories and consistent downrange precision. Built around a mid-length gas system paired with a standard .750" gas block platform, it delivers smooth cycling, low recoil impulse, and reduced wear on internal bolt components. The muzzle comes threaded in 5/8x24 TPI, making it easy to attach your favorite muzzle brake, compensator, or suppressor.

Technical Specifications

• Caliber: 6mm ARC (Advanced Rifle Cartridge)
• Length: 18 Inches
• Profile: Heavy Barrel
• Material: 4150 Chrome Moly Vanadium (CMV) Steel
• Twist Rate: 1:8
• Feed Ramps: .300 Blackout
• Gas System: Mid-Length
• Gas Block Journal: .750"
• Thread Pitch: 5/8x24 TPI
• Platform: AR-15 Upper Receivers