OE-SPEC 45 ACP- 8.0" AR15 Barrel- Nitride

(5 reviews)
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VALUE-LINE .45 ACP 8.0" AR15 Barrel- Nitride

• Chamber- 45 ACP

• Length- 8" (7.5" When compared to a standard AR15 barrel for handguard measurements)

• Threads- .578x28

• Finish- Melonite

• Twist- 1:16

• Material- 41V50 Chrome Moly Vanadium

• Marked for Caliber and Twist

• Weight- 17.36 OZ

• Fully Made In House From KAK Industry Produced Blanks

Taper profile 

As a high volume contract manufacturer for the firearms industry, KAK is able to leverage its machining capacity to bring the same quality parts that we provide to some of the biggest names in the industry, straight to the retail customer.  We manufacture our barrels from the raw material all the way to the complete product, all under our own roof.  Our barrels are fully inspected through the entire process, including air-gauging the bores, physical measurements of the threads and outer diameters, and 100% gauging of the headspace tolerance.  Our OE-Spec line provides you with the quality you demand and the value you desire.



45 ACP
AR15 Pistol Caliber


  • 4
    Looks awesome

    Posted by Joshua on October 19, 2023

    Been wanting to but an AR45 for a while, but never could find the right barrel, until now!

  • 5
    Great Barrel

    Posted by Al on August 31, 2022

    Used this for a blowback sub gun style AR pistol. Great quality, perfect fit and functions flawlessly. Very quick service. Thanks KAK!

  • 5
    Good Barrel for 45 ACP AR PCC build

    Posted by Craig on April 30, 2020

    Used this barrel on a PCC AR build. Only been able to put about 100 round through the completed build and accuracy has been very good so far.

  • 5
    Best barrel for the money

    Posted by James Monte on August 6, 2019

    Great pistol caliber AR barrel. Quality & cosmetics compare to more expensive barrels. You won’t go wrong with this barrel for your 45acp AR build.

  • 5

    Posted by Ed on January 11, 2019

    The .45 ACP KAK barrel mated up fine with an Aero Precision XL upper receiver and a Pantheon Arms Dolos system, plus an SB3A Tactical brace. I also used the .45 ACP KAK BCG and flash can/crush washer to complete the build. I also used a "Spartan" lower receiver, which was a bit of a challenge getting Glock magazines to fit...Mag modifications were required. The firearm has not been tested as of yet, but I don not anticipate issues other than buffer weight.