Anderson 20" 5.56x45 1:9" Heavy Barrel

Out of stock

Made in 'Merica by our good friends at Anderson machine. Amazing accuracy for the money. 

  • Chamber:5.56×45 NATO
  • 1:9" twist rate
  • For 0.936" gas blocks
  • 11-degree target crown
  • Phosphate finish
  • 4150 steel
  • Button rifled
  • Heavy profile
  • Uses a 15.125" Rifle-length gas tube
  • Length: 20"
  • Anderson model # AM-04-20HBAR-.936
  • Made in the USA
  • Weight: 1775g (3.9 lbs)

    You get:

    1. One barrel with Barrel Extension pre-installed

    Compatible with:

    • AR-15, M16 stripped uppers 
    • 0.936" gas blocks
    • Standard bolt carrier groups (you need to verify headspace to be safe)
    • Mil-spec barrel nuts (OEM and free-float grip nuts)
    • .223 Remington and 5.56x45mm NATO ammo

      Installation Difficulty:

      Tools required: 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. To break it in, simply

      1. Shoot 25-40 rounds
      2. Clean the bore
      3. Inspect the gas block to ensure it is still attached securely. Inspect the Bolt for unusual signs of wear.
      4. Repeat the above steps four more times.
        More Information
        Brand Anderson Manufacturing
        Exterior Profile Bull
        Muzzle thread Not threaded
        Gas system length Rifle-Length
        Barrel Length 20"
        Chamber 5.56×45mm NATO
        Gas Block Diameter 0.936
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