OE-SPEC- 5.56 12.5" Mid Gas, AR15 Barrel- Nitride

(30 reviews)
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VALUE-LINE 5.56 12.5" Mid Gas AR15 Barrel

• Chamber- 5.56 NATO

• Length- 12.5" 

• Gas system- Mid Length 

• Gas Block Size- .750

• Threads- 1/2-28

• Finish- Nitride 

• Twist- 1:7

• Material- 41V50

• Extension- M4 Feed Ramps 

• Barrel dimpled for gas block set screw

• Marked for Caliber and Twist

• Weight- 23.7 OZ

• Fully Made In House From KAK Industry Produced Blanks

All Barrels Are Air Gauge Inspected for Correct Bore Size & Tolerances, completed Barrels are Inspected for Proper Headspace using Calibrated Gauging.  



  • 5
    Very accurate

    Posted by Deon on August 18, 2023

    I’ve had this barrel for over 2 years now and it is just as accurate if not more accurate than some of my other more expensive barrels. Consistently shoots Hornady 68gn frontier into sub moa groups. I’ve shot this barrel out to 400yds a good bit with a 1-6x pa acss scope and it is spot on. Even taken a whitetail with it. Only about 75yds with a 62gn federal fusion. Usually don’t deer hunt with a 223 but with it being so accurate I am comfortable pulling the trigger knowing my bullet will hit the small area just behind the jaw below the ear in the neck dropping them immediately. Nice lightweight handy barrel. 100% reliable with many lowers/buffer setups. Even with my fostech echo trigger. But my preferred setup is this barrel rtb lightweight bcg, taccom 3 stage lightweight buffer, and vg6 atlas brake very flat shooting and absolutely no recoil or muzzle rise.

  • 5
    Great value and craftsmanship

    Posted by Domkratos on June 27, 2022

    First of all, for those wondering i ordered my barrel in may of 2022. I was concerned about the gas port size because others had mentioned it. I guess KAK listened to the feedback from customers, because my barrels gas port size was measured at .081. I'm still working on the build, but as of now, it's amazing quality and I'll definitely be championing more KAK products.

  • 5
    12.5 Mid is Perfect

    Posted by Jesse H on October 30, 2021

    Got this baby installed with adjustable gas block and H2 buffer. Switching to H3 buffer due to personal preference. Rocking a YHM Turbo K and this thing is beast

  • 5
    Cheap, Middy, Shorty=Perfection

    Posted by John17 on September 22, 2021

    No need to worry about dwell time with these, as theyre overgassed out of the box. Added a Geissele Super 42 H2 spring and buffer and i have just forward of 3 oclock ejection, which is right where i wanted it. This thing shoots so soft. I love it. 7/5 would buy again.

  • 5
    Great Barrel

    Posted by Deon on March 17, 2020

    Very nice machining, shipped on time. Love the mid length gas system. Shoots great for a short barrel. I’ve only got a few rounds though it still breaking in but with some hornady frontier 75gn bthp I was seeing well under inch groups at 50yds. Haven’t gotten a chance to shoot it any farther but from the one hole groups I was getting at 50yds there now doubt this thing will shoot moa. No ammo I tried shot more than 3/4” groups at 50yds

  • 5
    Great barrel

    Posted by Ben on February 8, 2020

    Measured the gas port at .087 for anyone that is curious. Added a JP clamp on front sight and adjustable gas block. Cycles steel cased ammo in 10f weather without issue. Tuned to run suppressed it would not quite lock back steel cased unsuppressed. Cycles brass cased ammo perfectly unsuppressed. No gas in the face shooting lefty. All done with a tubbz spring and carbine buffer. Amazing barrel for the money. Did not do any accuracy testing but was able to repeatedly hit a 4in plate using iron sights. Set up with a moe handguard.

  • 5
    Quality at and affordable price.

    Posted by William on February 4, 2020

    Very impressed with the look and performance of this barrel runs like a champ. KAK took care of me when USPS lost my package and all they could say was "sorry" KAK said no problem. I highly recommend this barell and KKAK stands by their word and product. Will continue to buy from them as ive already own their blast forwarding device.

  • 5
    A better Boomstick

    Posted by Ronnie on November 12, 2019

    Got this to replace a 7.5 inch bbl in order to get some power & velocity back. I'd read where many people had their doubts about the 12.5" mid gas cycling reliably, but so far, I've had no such problems. It's much quieter And, I'm much less likely to shoot my fingers off with this longer barrel. Well built, just right fit to the upper receiver, slick profiling, easy to index the gas port, uniform & strong finish, threads perfect for a muzzle device. So far, I've only shot it to get my sights on, but it's consistent. First product I've purchased from KAK, but I'm a KAK fan now. Only complaint is that the barrel isn't dimpled for gas block attachment.

  • 5

    Posted by Josh w on October 13, 2019

    This is the 2nd barrel from kak first one was a 11' still have it it's still doing me very very well with the 12.5 mid still one the break in faze and im gonna tell ya this one is looking just as good as the first one thanks