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KAK Industry 4" .45ACP Melonited AR-15 Barrel

Manufactured by KAK Industries


In Stock

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This KAK Industries .45 ACP barrel is a great option for building an extremely compact AR pistol. At 4” in length, this pistol caliber AR-15 barrel is the shortest you can find. It is made from 41V50 chrome moly steel and features a Melonite finish for long lasting durability. This .45 caliber barrel only weighs 8.8 ounces and has a tapered profile. It utilizes a 1:10 twist rate to help stabilize the large .45 caliber slug and is threaded .578x28, so you can attach a muzzle brake, flash hider, or even suppressor. This extremely short barrel is compatible with Mil-Spec upper receivers, so you can build the AR pistol or SBR that you have always wanted.

  • Ideal for AR-15 style pistol or SBR
  • Compatible with Mil-Spec upper receivers
  • Utilizes blow back system (no gas block or tube required)
  • Made from durable 41V50 steel and Melonite finish
  • Muzzle threaded .578x28 for muzzle brakes, flash suppressors, or compensators
  • Tapered profile only weighs 8.8 ounces
  • Machined form Green Mountain Barrel Blanks

Whether you are building a pistol caliber carbine for fun at the range or home defense, you can’t go wrong with the KAK Industries .45 caliber barrel. Because it is a pistol caliber, it utilizes a direct blowback system and does not need a gas tube or gas block. It simply uses the weight of the bolt and buffer to hold it locked long enough for reliable and safe shooting.

With a reputation for precision manufacturing, KAK Industry offers quality, American made components at affordable prices. They began as a single shop and grew to a huge manufacturing facility in California where they now produce more than 1.75 million firearms components a year. They have since expanded to even more locations, including testing facilities, so they can ensure that every one of their products meet the demands of shooters, hunters, and businesses everywhere.


Barrel CoatingMelonite
Barrel ContourTapered
Barrel Length4.0
Barrel LiningStainless Steel
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandKAK Industry
Caliber Gauge.45 ACP
Gas Seat DiameterN/A
Gas System LengthBlowback
ManufacturerKAK Industries
Thread Pattern.578 X 28
Twist Rate1:10
Weight8.8 Oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

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