Mk12 Barrel

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MK12 Barrel- Now available in Standard 18" Rifle length gas AND 16" Midlength gas! 

These are Crane Spec. MK12 barrels. These barrels are the result of tens of thousands of dollars in development done by the U.S. government to give our Special Operations guys the best weapon system they can have. We have spoken with many riflemen who have used these barrels and carried them in combat and have found unanimous satisfaction with their reliability and accuracy.



Material: 416R Stainless

Barrel extension: M4 feed ramps

Chamber: optimized for use with MK262 (Black Hills 77gr equivalent)

Twist: 1 in 7 right hand

Contour: for use with OPS inc.

Length: 18 in and threaded 1/2x28 for use with most common muzzle devices

Weight: 2 lbs 6.3 oz


*****Centurion Arms barrels require no further break in*****

***Requires gunsmith installation



  • 5
    Amazing Barrel and Company

    Posted by Adam P. on Apr 2nd 2020

    First off...Centurion Arms is a great company. Very helpful and quick to respond on any questions I had. There was an item that was misplaced during shipping and I emailed them in regards to that. Corrie responded within 15 minutes apologizing and 10 minutes after that I received tracking information and the part was delivered on my door step the next day on a Saturday.

    No for the barrel itself. It is amazing. Extremely tight fit into the upper receiver. We had to get a soft hammer and tap it into place. I do all my own hand loads, especially for the 77 grain projectiles. Out of several tests loads, I saw groups ranging from 1/2", 7/16", and 3/8" at 100 yards with different load calculations and projectile manufactures. As Bill said in a previous does not get better then that.

    I highly recommend this barrel in any MK12 build. Amazing barrel and amazing company. I look forward to ordering more products from Centurion Arms.

  • 5
    The Real Deal

    Posted by Bill Bronaugh on Sep 18th 2019

    Monty and his wife, Corrie, are the real deal. I couldnt write enough to convey their integrity to you here but when you spend money with Centurion rest assured that your money is truly going to people who deserve it. Simply the best people Ive had the distinct pleasure of doing business with.
    My Mk12 barrel shoots 4 rounds in a 3/8" cluster at 100 meters on its first trip to my range. Folks, now it just dont get much better than that. The machining of the chamber is artfully done as is the outside. Its very clean and the Cerakote well executed. I also had the FSB pinned and also opted for the Ops Inc and to say Im pleased is an understatement. Its perfection and thats about all I can really say.
    Centurion Arms deserves our support.