OE-SPEC 5.56 AR15 Barrel- 12.5" Mid Length, Chrome Lined Phosphate

SKU:
MO-121-0212-015
$154.95
(2 reviews)
Current Stock:
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 Chamber- 5.56 NATO

• Length- 12.5"

• Gas system- Mid Length

• Gas Block Size- .750

• Threads- 1/2-28

• Finish- Chrome Lined Phosphate  

• Twist- 1:7

• Material- 41V50 Chrome Moly Vanadium

• Extension- M4 Feed Ramps

• Barrel dimpled for gas block set screw

• Weight- 23.98 OZ

• Marked for Caliber and Twist

• 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.  

Caliber:
5.56
Finish:
Chrome Lined Phosphate
Length:
12.5"

Reviews

  • 5
    12.5 mid

    Posted by Ben Seeley on July 23, 2026

    Very pleased with this barrel. I had been curious for some time about the shorter length mid gas barrels, and must say the guys at KAK ported this thing perfectly. So far I’ve been using carbine receiver extension, sprinco blue, h1 buffer, suppressed and un suppressed, mostly with bulk m193. Sort of a strange combo; but that’s what yielded the best shooting experience, reliability, and function. H2 was fine as well, but the h1 seemed to be enough, with maybe a barely perceived less recoil because of the mass difference. Love the profile, and fit and finish of the barrel is great. I was on the fence between this sku, and the cold hammer forged, I’m sure that one would be great as well

  • 5
    Good choice for all-around rifle builds

    Posted by Diz on July 6, 2026

    This is a very good choice for hard use, all-around rifle build, especially if you may see occasional strings of rapid fire, and/or suppressed firing schedules. The chrome lining protects better from accelerated chamber wear. The phosphate finish is the perfect base for your favorite coating. And the 12.5" length is damn-near perfect for the general purpose rifle.