The CMMG 22LR Barrel Sub-Assembly (brand part no. 22D7C0A) is a 16.1-inch, M4-profile barrel built specifically for a custom dedicated .22 LR AR-15 upper. Machined from 4140 chrome moly steel and finished with a salt bath nitride coating inside and out, it’s built to shrug off rimfire fouling and hold up to high round counts without a dedicated cleaning regimen. A 1:16 twist rate is matched to standard .22 LR bullet weights, and the barrel is cut with a proper .22 LR sporting chamber rather than an adapted centerfire chamber. The muzzle is threaded 1/2-28 for a compensator, suppressor, or thread protector, and a .750-inch carbine-length gas journal keeps the rest of the build on standard AR-15 components.

Key Specifications

• Measures 16.1 inches in overall barrel length.
• Machined with a standard M4 profile for compatibility with common AR-15 handguards.
• Constructed from 4140 chrome moly steel.
• Finished with a salt bath nitride coating inside and out for corrosion resistance.
• Cut with a 1:16 twist rate, matched to standard .22 LR bullet weights.
• Chambered with a proper .22 LR sporting chamber.
• Threaded 1/2-28 for a compensator, suppressor, or thread protector.
• Uses a .750-inch carbine-length gas journal for standard AR-15 gas block compatibility.

Frequently Asked Questions

What caliber is this barrel chambered in? .22 LR, with a proper rimfire sporting chamber rather than an adapted centerfire chamber.

Is the muzzle threaded? Yes, 1/2-28, ready for a compensator, suppressor, or thread protector.

What gas block size does it use? A .750-inch carbine-length journal, standard for common AR-15 low-profile gas blocks.

Buy the CMMG 22LR Barrel Sub-Assembly

A dedicated rimfire chamber and nitride-treated bore make this barrel the right foundation for a low-cost, high-round-count .22 LR AR-15 upper. Order it from CMMG through our Lubbock, Texas gun shop for fast, direct shipping, and browse more AR barrels to finish your build.