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Questions & Answers
Does this barrel come with the gas block in the picture.

Answer is no but centurion arms makes a specific gas block that has a index tab that mates up with a milled out piece on the barrel.

by Rick, Verified Owner, May 15, 2021
Will these barrels fit the Precision Reflex gas blocks of the Mod 0? What kind of gunsmithing needs to be done for installation?

Any regular gas black with the correct journal diameter can be used, but the Centurion gas blocks have the alignment tab to ensure correct alignment during installation. You would be able to use the PRI flip up sight gas block.

by David Tanner, Verified Owner, May 6, 2024
Customer Reviews
Helpful Positive Review Centurion arms MK12 Barrel by Rick, Verified Owner, December 11, 2020
The MK12 Barrel is a top notch machined part. It will make your rifle a hole puncher. I seriously cannot recommend this barrel anymore except it is awesome and above all expectations. Centurion arms makes a specific gas block that tabs into a machine...
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2/2 found this helpful
Helpful Negative Review Very well machined, very poorly packaged and/or stored by Jim P, Verified Owner, September 5, 2023
The machining and finish on these barrels is excellent. Had they been packaged and stored properly they would have probably been excellent barrels. I ordered 3 of these, and on inspection 2 of the 3 had noticeable rusting at the muzzle ends of the ri...
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6/7 found this helpful
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Product Info for Centurion Arms MK 12 Threaded Rifle Barrel

Centurion Arms MK12 Rifle Barrels are the result of development done by the U.S. government to give Special Operations forces the best possible weapon system. Troops who have carried these AR15 Barrels from Centurion Arms give them high marks for reliability and accuracy. Centurion Arms MK12 Crane Spec. Rifle Barrels are manufactured from 416R stainless steel with a stainless finish. Get special ops quality when you upgrade to the Centurion Arms MK12 18 inch Rifle Barrel.image

Specifications for Centurion Arms MK 12 Threaded Rifle Barrel:

Manufacturer: Centurion Arms
Color: Stainless
Finish: Stainless
Fabric/Material: 416R Stainless Steel
Barrel Length: 18 in
Barrel Profile: MK12
Gas System Length: Rifle Length
Threads per Inch: 1/2x28
Barrel Twist Rate: 1-7
Barrel Material: 416R Stainless Steel
Gun Make: Century Arms
Weight: 2.4 oz, 2.4 lb

Features of Centurion Arms MK 12 Threaded Rifle Barrel:

  • Barrel Extension: M4 Feed Ramps
  • Chamber: Optimized for use with MK262 (Black Hills 77gr equivalent)
  • Contour: for use with OPS inc.
  • Centurion Arms barrels serve as HBAR barrels
  • Centurion Arms barrels require no further break in
  • Requires gunsmith installation

Package Contents:

  • Centurion Arms MK 12 Threaded Rifle Barrel

Centurion Arms MK 12 Threaded Rifle Barrel Orderable Models

List of Orderable Models

USED, Centurion Arms Threaded Rifle Barrel, MK12, 18 in 416R Stainless Steel, 1/2x28, 1-7 Twist, Rifle Length, Stainless, NSN 9305.20.9000, MK12B , MPN: MK12B-EDEMO , Code: 2TB-ATB-CAMKBR-MK12B-EDEMO-DF-C
Centurion Arms Threaded Rifle Barrel, MK12, 18 in 416R Stainless Steel, 1/2x28, 1-7 Twist, Rifle Length, Stainless, NSN 9305.20.9000, MK12B , MPN: MK12B , UPC: 855286007072 , Code: 2TB-ATB-CAMKBR-MK12B
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