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Anderson 16" 5.56×45 M4 Barrel Assembly w/FSB, RF85-Treated

Out of stock

For a traditional (non-free-float) build, this assembly will save you some time and hassle of installing the front sight. Front sight post is attached, pinned, and secured to the barrel, just like if you bought a complete rifle. No drilling necessary. Just add your own handguard, weld spring, delta ring, and snap ring.

Front sight is F-marked for flat top upper reciever; will also work with a A2-style (carry handle) receiver rear sights.

Anderson's RF85 finish is a proprietary technology that deposits calcium atoms into the metal surface, which reduces the friction by 85% (hence the name RF85). This makes cleanup a lot easier and roughly doubles the lifespan of the barrel.

Made in 'Merica by our good friends at Anderson machine.

  • Chamber: 5.56x45 NATO
  • 1:8" twist rate
  • For 0.75" gas blocks
  • 1/2"-28 muzzle threads
  • Phosphate finish
  • Button rifled
  • 4150 steel
  • Front Sight Block pre-installed (F-marked)
  • Uses a 9.75" Carbine gas tube
  • Length: 16"
  • Anderson model # B2-K650-A001-R
  • Made in the USA
  • Weight: 1010g

    You get:

    • One barrel with Barrel Extension, front-sight, sling swivel, handguard front cap, and barrel nut pre-installed

      Compatible with:

      • AR-15, M16 stripped uppers 
      • 0.75" gas blocks
      • Muzzle devices with 1/2"-28 threads
      • 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. 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.