OE-SPEC 300 Blackout- 13.9" AR15 Barrel- Carbine Gas, Nitride

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300 Blackout 13.9" Carbine Gas AR15 Barrel

• Chamber- 300 BLK
• Length- 13.9"
• Gas- system Carbine
• Gas Block Size- 750
• Threads- 5/8x24
• Finish- Nitride
• Twist- 1:7
• Material 5R - 41V50 Chrome Moly Vanadium
• Treatment- Nitride 
• Barrel dimpled for gas block set screw
• Extension- M4
• Marked for Caliber and Twist
• Fully Made In House From KAK Industry Produced Blanks


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.

300 Blackout


  • 5
    13.9 300 blackout barrel.

    Posted by Vasco Wright on October 24, 2023

    I ordered this barrel to complete a 300 blackout built that I was doing for one of my NRA classes that I teach then to hunt with this year. I ordered this barrel on 10th October and I received it on the three days after fast shipping especially through USPS. Finally got around to putting it together, I put 25 rounds down range just to function test it because I heard horror stories about carbine gas systems on 300 blackout barrel and I am pleased to say I did not have not one issue it ran like a dream. I sighted it in. I let the students use it to see what the difference was between 5.56/223 and 300 blackout shot another 800 rounds down range with no issues at all using steel case ammo. The students was please, I was please also had 3 people since then ask me about who made the barrel and I am pleased to say KAK industry. I will recommend this company to all my friends and family