CMMG 16 Inch 350 Legend AR 15 Barrel – 1:16 Twist – Carbine

SKU: 35D5F0A

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AT3™ Low Profile Micro Steel Gas Block - 4 Sizes Available

AT3™ Low Profile Micro Steel Gas Block - .750"


AT3™ AR 15 Gas Tube & Carbine Gas Tube Length

AT3 Stainless Gas Tube with Roll Pins - Carbine Length


Legendary CMMG Quality for the New 350 Cartridge

CMMG makes some of the best components for the AR-15 on the market.  This barrel for the new .350 Legend cartridge is no exception.   With a 16 inch length, with a durable salt bath nitride finish, this barrel serves as a solid beginning to a perfect hunting-focused build for your AR-15.  This isn’t a heavyweight barrel either – you’ll be able to take full advantage of the .350 Legend’s mild recoil impulse, with a rifle that isn’t going to weigh you down excessively in the field.

Cross-Compatible Parts

One of the best features of the 350 Legend is that it doesn’t require too many special components.  You use a standard 5.56 bolt carrier group, .750″ gas block, and Carbine gas tube.  For better reliability with the straight-walled 350 Legend cartridge, make sure to use a magazine specific for the caliber.

Since the projectiles in .350 Legend are similar to 9mm, choose a 9mm muzzle device that’s threaded for 1/2×28.


  • Caliber: .350 LEGEND
  • Length: 16.1 Inches
  • Twist Rate: 1:16
  • Material: 4140 CM
  • Muzzle Thread: 1/2×28 – Warning: Use only with 9mm compatible muzzle devices
  • Gas System: Carbine
  • Gas Block Diameter: .750″
  • Finish: Nitride


Caliber.350 Legend
Barrel Length16.1 inches
Barrel Twist Rate1:16 inches
Barrel Material4140 CMV
Muzzle Threads1/2/2028
Barrel FinishBlack Nitride
Gas Block Size.750″ Gas Block
Barrel ProfileMedium
Barrel Gas SystemCarbine
Gas Block Journal Length1.9 inches
Barrel ExtensionM4
Weight25 ounces

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

CMMG Warranty

Seller warrants to Buyer that for a period of 6 months from the Delivery Date, all Goods will be:

  • Free from any defects in workmanship, material, and design
  • Conform to applicable specifications[, drawings, designs, samples and other requirements specified by Buyer]
  • Fit for their intended purpose and operate as intended
  • Merchantable
  • Free and clear of all liens, security interests or other encumbrances
  • Not infringe or misappropriate any third party’s patent or other intellectual property rights.

Inspection and Rejection of Nonconforming Goods

The Buyer has the right to inspect the Goods for a period of thirty (30) days after the Delivery Date. Buyer, at its sole option, may inspect all or a sample of the Goods and may reject all or any portion of the Goods if it determines the Goods are non-conforming or defective.

If Buyer rejects any portion of the Goods, Buyer has the right, effective upon written notice to Seller, to:

  • Rescind the Order in its entirety
  • Accept the Goods at a reasonably reduced price
  • Reject the Goods and require replacement of the rejected Goods.


If Buyer requires replacement of the Goods, Seller shall, at its expense, promptly/within 30 days replace the nonconforming Goods and pay for all related expenses, including, but not limited to, transportation charges for the return of the defective goods and the delivery of replacement Goods.

If Seller fails to timely deliver replacement Goods, Buyer may replace them with goods from a third party and charge Seller the cost thereof and terminate this Order for cause pursuant to Section 20.

Any inspection or other action by Buyer under this Section shall not reduce or otherwise affect Seller’s obligations under the Order, and Buyer shall have the right to conduct further inspections after Seller has carried out its remedial actions.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 1 review
Richard Moreland
350 legend

The rifle mate’s perfect to a colt upper barrel fit was perfect,have not had chance to shoot yet ,but loaded clip an it shucked them out caint wait to shoot,great product thanks guy’s

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