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CMMG 16.1″ M4 4140CM 22LR Barrel Sub-Assembly

UPC: 815835014722

$165.99

3 in stock

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Description

Building a dedicated 22LR upper means you need a barrel that's designed specifically for rimfire, not a conversion kit trying to work in a centerfire barrel. This CMMG sub-assembly is the real deal. The 4140 chrome moly steel is treated with salt bath nitride finish inside and out, giving you a barrel that can handle extended shooting without degrading. You're looking at a proven platform that serious builders trust.

What Makes This CMMG Barrel Work for 22LR

The 1:16 twist rate is the industry standard for 22LR, meaning this barrel is optimized for the way rimfire ammunition actually performs. The M4 profile gives you that familiar carbine contour at 16.1 inches, which is right in the sweet spot for powder burn and velocity. The .750-inch carbine length journal maintains compatibility with standard AR-15 components, and the 1/2-28 threads let you add a suppressor or muzzle device if you want.

Sporting Chamber for Function and Accuracy

This isn't just any bore. The 22LR sporting chamber is cut with the specific tolerances that rimfire needs. Pair this barrel with a dedicated 22LR bolt group and magazines, and you've got a purpose-built system that runs clean and accurate. You'll notice the difference in groupings compared to conversion kits stuffed into centerfire barrels.

Durable Finish That Lasts

The salt bath nitride finish is applied throughout the barrel. You get corrosion resistance and hardness without the hassle of stainless steel. This finish handles lead buildup better than bare steel and stands up to regular cleaning and shooting sessions. The barrel ships as a sub-assembly, ready to press into your upper receiver.

Key Specifications

  • Caliber: .22 Long Rifle
  • Barrel Length: 16.1 inches
  • Barrel Profile: M4
  • Material: 4140 Chrome Moly Steel
  • Finish: Salt Bath Nitride
  • Twist Rate: 1:16 inch
  • Chamber: .22LR Sporting
  • Muzzle Threads: 1/2-28
  • Gas Journal: .750 inch Carbine length
  • Manufacturer: CMMG
  • MPN: 22D7C0A
  • UPC: 815835014722

What’s Included

  • CMMG 16.1 inch 22LR barrel sub-assembly

Frequently Asked Questions

Do I need special components to use this 22LR barrel?

Yes, you need a dedicated 22LR bolt group and 22LR AR-15 magazines. Standard 5.56 bolt carriers and magazines won't work with this barrel. The 22LR uses a different bore size and firing system, so it requires dedicated parts throughout the upper receiver.

What ammo works best with this barrel?

Standard velocity 22LR ammunition in the 36-40 grain range performs reliably. Higher velocity ammo can work, but standard velocity rounds tend to deliver better accuracy and more consistent function. Avoid extremely underpowered target loads if you want reliable cycling with your bolt carrier.

Can I put a muzzle device on this barrel?

Absolutely. The 1/2-28 threads accept standard AR muzzle brakes and suppressors designed for that thread pattern. Many people run suppressors on 22LR uppers since they already shoot quietly, and it makes the setup even more pleasant for training or plinking.

Is this barrel compatible with my standard AR-15 upper receiver?

It will fit dimensionally, but you'll need the right bolt group and magazines for 22LR. The barrel itself installs like any other AR barrel, but running 22LR ammo through a centerfire upper designed for 5.56 or 223 won't work properly. This barrel is meant for a dedicated 22LR upper build.

Additional information

UPC

815835014722

Manufacturer

Manufacturer Part Number

22D7C0A

Shipping Weight

2.045

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