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CNA Canadian National Arms Barrels,5.56 1:7" M4 (Stainless)

  • 20517


TNA is proud to offer the new Canadian National Arms line of barrels in all your favorite lengths.

We will be getting more length options at some point moving forward but for now  THESE FUCKING ROCK!

Pre-finished with a barrel extension with M4 feedramps

  • Chamber: 223 Wylde (optimized for 5.56 AND 223 Rem)
  • 1:7" twist rate
  • For 0.750" gas blocks
  • 1/2"-28 muzzle threads
  • 416R Stainless steel
  • Polished 
  • Button Rifled
  • Made in the USA
Length Gas System Weight
7.5" Pistol (6.7" gas tube)
10.5" Carbine (9.75" gas tube)
16" Carbine (9.75" gas tube)

Exterior profile:

  • M4

You get:

  • One barrel with Barrel Extension pre-installed

    Compatible with:

    • AR-15, M16 stripped uppers 
    • 0.750" gas blocks
    • Muzzle devices with 1/2"-28 muzzle threads
    • Standard bolt carrier groups (you need to verify headspace to be safe)
    • Mil-spec barrel nuts (OEM and free-float grip nuts)

      Installation Difficulty:

      Tools required: For the barrel itself, none but to get it installed and working you should have the Armourers tool and a vice block.

      Installation notes: You will need a gas tube of the correct length. Besides that, Youtube is your friend, and it is highly recommended to check the headspace.

      These barrels should be broken in. Doing so will help your barrel perform consistently over its lifespan. How to break in your new barrel:

      1. Clean the bore thoroughly before firing for the first time.
      2. Fire 5 rounds, then clean the bore.
      3. Repeat step #2 three more times.
      4. Check that the gas block is still securely fastened.
      5. Inspect the bolt for signs of wear.
      6. Check that your handguard is still nice and tight
      7. Fire 25 rounds, the clean the bore.
      8. Repeat step #7 three more times.


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