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CMMG
The CMMG 16.1" M4 barrel sub-assembly is purpose-built for shooters looking to roll their own dedicated .22 LR AR-15 upper receiver. This isn't a compromise part—it's a complete barrel solution engineered specifically for rimfire, letting you build a reliable, accurate .22 platform without adapters or workarounds. Whether you're setting up a dedicated training rifle, a quiet range gun, or a budget-friendly plinker that shares your AR-15 lower, this sub-assembly gives you the foundation to do it right.
Built from 4140 chrome moly steel and finished with salt bath nitride inside and out, the barrel delivers the durability you'd expect from a centerfire AR—corrosion resistance and wear protection that outlasts casual shooting. The M4 profile keeps weight down while maintaining rigidity, and the 1:16 twist is optimized for standard .22 LR ammunition. Threading is 1/2-28", and the .750" carbine-length journal matches your AR-15 upper receiver dimensions. The included barrel collar lets you replace the chamber adapter on compatible CMMG .22 conversion uppers if you decide to swap between dedicated and conversion setups.
This is a no-frills, no-BS part for the builder who wants a better .22 LR AR than what adapter kits offer. You'll need the rest of your upper components—bolt carrier group, charging handle, and hand guard—but the hard part is already engineered and ready to go.
| Barrel Length | 16.1" |
| Barrel Profile | M4 |
| Material | 4140 Chrome Moly |
| Finish | Salt Bath Nitride |
| Caliber | .22 LR |
| Chamber | .22 LR Sporting |
| Twist Rate | 1:16 |
| Threading | 1/2-28" |
| Journal Length | Carbine (.750") |
| Included Accessories | Barrel collar |
Yes. The .750" carbine-length journal and 1/2-28" threading match AR-15 upper receiver dimensions. You'll need a compatible bolt carrier group and upper components to complete the assembly.
The barrel collar included with this sub-assembly is designed to replace the chamber adapter on CMMG .22 conversion uppers, making integration straightforward if you decide to run a conversion setup instead.
This barrel is chambered in .22 LR with a 1:16 twist optimized for standard .22 LR ammunition.
This sub-assembly includes the barrel and collar only. You'll need to source a bolt carrier group, charging handle, upper receiver, and hand guard separately to complete your upper receiver assembly.
CMMG
The CMMG 16.1" M4 barrel sub-assembly is purpose-built for shooters looking to roll their own dedicated .22 LR AR-15 upper receiver. This isn't a compromise part—it's a complete barrel solution engineered specifically for rimfire, letting you build a reliable, accurate .22 platform without adapters or workarounds. Whether you're setting up a dedicated training rifle, a quiet range gun, or a budget-friendly plinker that shares your AR-15 lower, this sub-assembly gives you the foundation to do it right.
Built from 4140 chrome moly steel and finished with salt bath nitride inside and out, the barrel delivers the durability you'd expect from a centerfire AR—corrosion resistance and wear protection that outlasts casual shooting. The M4 profile keeps weight down while maintaining rigidity, and the 1:16 twist is optimized for standard .22 LR ammunition. Threading is 1/2-28", and the .750" carbine-length journal matches your AR-15 upper receiver dimensions. The included barrel collar lets you replace the chamber adapter on compatible CMMG .22 conversion uppers if you decide to swap between dedicated and conversion setups.
This is a no-frills, no-BS part for the builder who wants a better .22 LR AR than what adapter kits offer. You'll need the rest of your upper components—bolt carrier group, charging handle, and hand guard—but the hard part is already engineered and ready to go.
| Barrel Length | 16.1" |
| Barrel Profile | M4 |
| Material | 4140 Chrome Moly |
| Finish | Salt Bath Nitride |
| Caliber | .22 LR |
| Chamber | .22 LR Sporting |
| Twist Rate | 1:16 |
| Threading | 1/2-28" |
| Journal Length | Carbine (.750") |
| Included Accessories | Barrel collar |
Yes. The .750" carbine-length journal and 1/2-28" threading match AR-15 upper receiver dimensions. You'll need a compatible bolt carrier group and upper components to complete the assembly.
The barrel collar included with this sub-assembly is designed to replace the chamber adapter on CMMG .22 conversion uppers, making integration straightforward if you decide to run a conversion setup instead.
This barrel is chambered in .22 LR with a 1:16 twist optimized for standard .22 LR ammunition.
This sub-assembly includes the barrel and collar only. You'll need to source a bolt carrier group, charging handle, upper receiver, and hand guard separately to complete your upper receiver assembly.
