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CNA Canadian National Arms Barrels, 6.5 Grendel II 1:8" w/ FREE Bolt Kit

  • 27497

TNA is proud to offer a new line of Canadian National Arms line of barrels in nitride finish in all your favorite NR lengths. 

Nitride is an alternative to chrome-lining that makes the metal surface very hard, resistant to wear, and easy to clean. Although chrome-lining is the gold standard for barrel lining, it is more challenging to manufacture accurately because the chrome adds thickness to the surface. Nitriding maintains dimensions, so the bore comes out of the treatment process the same size it went in.

Should hold 1 MOA accuracy (or better) at 100 yards assuming decent quality ammo.

  • Chamber: 6.5 Grendel II
  • 1:8" twist rate
  • For 0.750" gas blocks
  • 5/8"-24 muzzle threads
  • HBAR/heavy exterior profile (0.98" thick from the breech to the gas block, 0.75" from the gas block to the muzzle)
  • 4150 Chromoly Vanadium steel
  • Heat-treated to RC 28-32ish then stress-relieved
  • Black nitride finish inside and out
  • Button-rifled
  • Steel-case ammo not recommended
  • Finished with a barrel extension with M4 feedramps
  • Made in the USA
Length Gas System Fluting Weight
20" Rifle (15.125" gas tube) None 1490g
24" Rifle (15.125" gas tube) Straight 1550g


  • MPI-inspected
  • Parkerized finish
  • Roll-marked "6.5 Grendel" to distinguish it from other bolts

You get:

  • (1) Barrel with barrel extension pre-installed
  • (1) Stripped 6.5 Grendel II Bolt (bring your own Bolt Carrier, Gas Key, etc)
  • (1) Bolt parts kit (gas rings, ejector/extractor stuff) -- note there is assembly required!

    Compatible with:

    • AR-15, M16 et al stripped uppers 
    • 0.750" gas blocks
    • Muzzle devices with 5/8"-24 muzzle threads
    • Included bolt (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 tool to hold the barrel such as a BEV 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 as we have not!

      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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