OE-SPEC- 300 Blackout 8.5" Pistol Gas AR15 Barrel- Nitride

(34 reviews)
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VALUE-LINE 300 Blackout 8.5" Pistol Gas AR15 Barrel- Nitride

• Chamber- 300 Blackout 

• Length- 8.5"

• Gas system- Pistol Length

• Gas Block Size- .750

• Threads- 5/8-24

• Finish- Nitride

• Twist- 1:7 5R

• Material- 41V50 Chrome Moly Vanadium

• Extension- M4 Ramps 

• Barrel dimpled for gas block set screw

• Marked for Caliber and Twist

• Weight 19.7 OZ

• 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
    Looks Great

    Posted by RR on April 13, 2018

    The barrel finish is excellent. If it shoots half as well as it looks, it will be a winner!

  • 5
    Great barrel for a pistol build !

    Posted by Caleb on November 13, 2017

    Good price and great value

  • 5
    Great barrel...but buy some good bits

    Posted by Chris on September 15, 2017

    This is a fantastic barrel...I won't even say the "for the money" because I think this would be a great barrel if you paid $275 for it, much less $100. I bought a "budget" barrel (that I ended up returning) before deciding on this one. The other company's nitriding process left nasty yellow salts leaking from between the barrel and barrel extension...NOT GOOD. So I ordered this KAK barrel based on other reviews. I'll say this, I set the two barrels side by side. The cheaper one cost me $65, the KAK only $35 more, but you could tell the quality difference. The cheaper barrel had an extremely light nitride treatment...almost phosphate looking. The KAK was a very, very dark black...which is more of what I expected. That's where my only "issue" comes into play with this barrel. And it's not really an issue, but just something that I've dealt with (and I think another reviewer brought this up too) and that is, the nitriding is EXTREMELY hard. Not coming pre-dimpled wasn't an issue for me as I have a dimpling jig....but the bits I had already were no where near up to the task of cutting through the surface. I spent an hour and a half, off and on, trying to cut the dimple and only ended up with a dimple the size of a ball point pen. Went to the store today and bought 2 brand new bits (one titanium and the other a cobalt) and I was in a little bit better shape, but it still took me another hour and a half to get the dimple the right size. So...with all that said, if you are on the fence about buying this barrel, I say, DO IT! It's a great barrel and you'll be hard pressed to find a better deal. However, if you plan on dimpling for a gas block, make sure your bits are sharp and are either cobalt or titanium (I tried using a black oxide bit and the barrel just laughed at it). Thank you KAK for a fantastic product!

  • 5
    Well worth it

    Posted by Josh on September 14, 2017

    For the price this is an excellent option. 8.5" barrel so accuracy wasnt my main concern. I put it on paper at 50 with a decent group with 2 of the holes touching shooting some 120 gr then took it to 100 yds and landed about a 2.5" group. I plan to try different ammo and something other than a red dot to see how tight i can group it. Excellent value and i would highly recommend

  • 5
    It works!

    Posted by Brandon on September 12, 2017

    I have only fired at 25 yard targets. With high velocity. 300 BLK rounds, my grouping was at 1/2. Good enough for shooting at 25 yards I say.

  • 5

    Posted by Kalum on July 30, 2017

    Great barrel for price. Grouping was better then i expected

  • 5
    Outstanding value, super fast order processing

    Posted by william on April 15, 2017

    Ordered on Friday, in mailbox the following Monday (from CA to AL via USPS no less!). I completed my pistol build and performed a 'unit test' yesterday. Zero problems with a wide variety of my 300 BO hand loads. Anybody thinking about a pistol or SBR build should look at this barrel first. It is hard to believe that it only cost $100 + shipping. I also can't say enough good things about KAK, their product quality and their customer service. This is the third order I've placed with then and in all cases the product was in my mailbox in 4 days or less (CA to AL). They are definitely the first place I look to for my AR parts need.

  • 5
    Great barrel

    Posted by Benjamin on March 27, 2017

    I have been building AR platforms for a long time and this is a great barrel especially having the blanks coming from Green Mountain . The only negative is it has 5.56 feed ramps not .308. Other than that it's outstanding.

  • 5
    Great barrel

    Posted by Ted L on February 8, 2017

    Fit & finish suburb. Doesn't appear to be a value priced barrel, it's that good.