CMMG 12.5″ Multi-Role Profile Barrel Sub-Assembly – 5.56mm NATO, 4140CM Steel, Salt Bath Nitride

Maximize your AR build’s versatility with the CMMG 12.5″ Multi-Role Profile Barrel Sub-Assembly, crafted from 4140 chrome-moly steel and finished in rugged salt bath nitride for exceptional durability and precision performance in tactical or SBR applications.

Designed for shooters who demand versatility, this 12.5-inch barrel from CMMG is ideal for multi-purpose AR-15 builds—from tactical short-barreled rifles (SBRs) to suppressed pistol configurations. Engineered with 4140 chrome-moly (CM) steel, the barrel ensures long-lasting performance under heat and high round counts. The salt bath nitride finish enhances corrosion resistance and surface hardness without compromising accuracy.

Its multi-role profile offers an ideal balance between weight and rigidity, while the 1/2×28 muzzle threading ensures compatibility with common 5.56/.223 muzzle devices and suppressors.

Key Features of CMMG 12.5″ Multi-Role Profile Barrel Sub-Assembly – 5.56mm NATO, 4140CM Steel, Salt Bath Nitride

Multi-Role Barrel Profile

• Balanced weight for agile handling

• Optimized for both suppressed and unsuppressed use

️ 4140 Chrome-Moly Steel Construction

• Known for strength, durability, and heat tolerance

• Ideal for high-volume shooting and rough conditions

Salt Bath Nitride Finish

• Deep surface hardening for extended lifespan

• Enhanced corrosion resistance and low-reflection matte black look

Threaded Muzzle

• 1/2×28 TPI – fits standard 5.56/.223 muzzle brakes, flash hiders & suppressors

• Easy compatibility with aftermarket muzzle devices

Technical Specifications of CMMG 12.5″ Multi-Role Profile Barrel Sub-Assembly

Frequently Asked Questions

Q: Can I use this barrel with a suppressor?
A: Yes! It features 1/2×28 threads compatible with most suppressors for 5.56/.223.

Q: Is this barrel suitable for full-auto or rapid fire?
A: Absolutely. The 4140CM steel and nitride finish are designed for high heat and wear tolerance.

Q: Does this include a gas block or gas tube?
A: No, this is a barrel-only sub-assembly; you’ll need to source your gas components separately.

Build a Compact Powerhouse with CMMG Quality

The CMMG 12.5″ Multi-Role Barrel is the perfect foundation for any SBR or AR pistol project. With rugged materials, premium finish, and tactical versatility, this barrel gives you the accuracy, durability, and compatibility needed to take your build to the next level.

Ready to upgrade? Add it to your cart now and elevate your rifle’s performance.

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