Boss Barrels .338 ARC 12" Carbon Fiber Barrel - AR-15 Compatible

Boss Barrels .338 ARC 12" Carbon Fiber Barrel - AR-15 Compatible

Unlock the full potential of your short-barreled rifle or AR pistol with the ultimate combination of massive caliber performance and lightweight agility. Engineered for shooters who refuse to sacrifice speed for stopping power, this 12-inch 338 ARC barrel brings devastating energy to a compact platform without the front-heavy burden of traditional steel contours. By fusing a precision-machined, air-gauged 416R stainless steel core with cutting-edge aerospace-grade composite materials, we have created a barrel that sheds massive weight while maintaining absolute structural rigidity.

Whether you are navigating tight stages at the range or tracking game through dense brush, this barrel is built to dominate. The 338 ARC cartridge is built to hit hard, and this barrel ensures every shot lands exactly where you want it, backed by an ironclad Sub-MOA Guarantee. Thanks to a proprietary multi-step manufacturing process and specialized thermally conductive material blends, heat dissipates rapidly away from the bore. This eliminates thermal drift and keeps your point of impact perfectly stable, even during intensive strings of rapid fire. Upgrade your build with a barrel that turns your compact rifle into a quiet, hard-hitting precision machine.

Aerospace Composite Technology
Manufactured in-house with advanced composite layering to deliver a featherweight footprint of just 1 lb 6 oz, dramatically improving weapon maneuverability and reducing user fatigue.

Premium 416R Stainless Steel Blank
Built from a fully stress-relieved and air-gauged stainless core, turned to an optimized profile to guarantee match-grade consistency and exceptional long-term durability.

Sub-MOA Accuracy Guarantee
Crafted to uncompromising precision standards to ensure your rifle groups under a Minute of Angle out of the box for competitive-grade repeatability.

Advanced Thermal Management
Utilizes a proprietary blend of thermally conductive matrix materials that pull heat rapidly away from the chamber, preventing barrel warp and minimizing point-of-impact shift.

Optimized 1/8 Twist & 5R Rifling
Specially engineered to stabilize heavy-grain supersonic and subsonic 338 ARC projectiles while reducing bullet deformation for ultra-consistent terminal ballistics.

Pistol-Length Gas System
Tuned for flawless cycling and optimized gas pressure, ensuring soft-shooting reliability whether running suppressed or unsuppressed.

Nitride-Coated Enhanced Extension
Features a match-grade, enhanced M4-style barrel extension treated with a rugged nitride finish for ultra-smooth cartridge feeding and maximum wear resistance.

Recessed Target Crown
Protects the critical muzzle rifling from accidental field dings and impacts, ensuring a clean, uniform gas release as the bullet exits.

Specifications

• Caliber: 338 ARC (Advanced Rifle Cartridge)
• Length: 12 inches
• Core Material: 416R Stainless Steel (Fully Stress-Relieved, Air-Gauged)
• Sleeve Material: Advanced Aerospace-Grade Composite
• Twist Rate: 1/8
• Rifling: 5R
• Weight: 1 lb 6 oz
• Gas System Length: Pistol
• Gas Block Diameter: 0.750 inches
• Gas Block Journal Length: 1.02 inches
• Muzzle Thread: 5/8"-24
• Crown: Recessed Target Crown
• Barrel Extension: Match Grade Enhanced M4 (Nitride Coated)
• Accuracy Standard: Sub-MOA Guaranteed