OE-SPEC 5.56- 4.75" AR15 Barrel- Nitride

(24 reviews)
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VALUE-LINE 5.56 4.75" AR15 Barrel- Nitride

• Chamber- 5.56 NATO

• Length- 4.75"

• Gas system- Micro Pistol Length

• Gas Block Size- .750

• Threads- 1/2-28

• Finish- Melonite 

• Twist- 1:7

• Material- 41V50 Chrome Moly Vanadium

• Extension- M4 Feed Ramps 

• Marked for Caliber and Twist

• Gas Block Dimple

• Weight- 10.72 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.




  • 5
    Micro ARP Build

    Posted by Paul Kuehn on March 5, 2024

    This was one of the parts I needed to complete a micro ARP chambered in 5.56 with a 4.75” barrel, 5.5” M-Lok handguard and fluted flash can. KAK has some great products and fantastic customer service too.

  • 5

    Posted by Joseph brouseau on July 10, 2023

    This barrel was exactly whatbi was looking for fit and finish is perfect.

  • 4
    Great unique length item.

    Posted by Zac on June 14, 2022

    I loved this build! make sure to order the micro tube and a .750 block. wish there was a combo pack option with the barrel.

  • 4
    Fun build

    Posted by Adam on October 8, 2021

    Not long enough to be effective but makes for an AWESOME, attention getting build!

  • 4
    Loud as hell.

    Posted by Vinny on August 8, 2021

    This is a good little barrel. It sounds like a large caliber gun going off when you fire it.. It works great with the micro gas tube.Both are a little over priced for what you get. But they work.

  • 5

    Posted by RAD INDUSTRIES LLC on August 4, 2021

    WE USE THESE IN OUR FRT BUILDS.... SICK!!! is not even close...

  • 5
    4.75 Barrel

    Posted by James on June 4, 2021

    I love this little barrel All my friends are jealous I have the shortest pistol around. This is really cool for night time shooting what a Flash wow .

  • 5
    Great Produck

    Posted by Lavar on April 19, 2021

    This is my 3rd 4.75 inch barrel I have them all now. Love KAK products! Customer service is great. now for the barrel I haven't finished my build yet but I have 4.75 in .300 BO and boy is it fun to shoot. cycles fine no false feeds or cycling issues, so I'm sure my 556 and 762 will be the same. thanks again KAK

  • 5
    The Short Boom Stick

    Posted by Sj on November 26, 2020

    I first ordered this thinking it would be impossible to be accurate and cycle the rounds adequately. I was shocked and amazed . It was more accurate the 7.5 in 223 Wylde stainless barrel I had . I bought it to intimidate the guys in the range and hopefully for self defense. It did both perfectly. If you want a home defense barrel that can fire 77 grain projectiles and go through walls so it goes to the intruders and not wait for intruders to come to you . This is it! Recoil is minimal. The concussion blast shakes the walls . They have increased the price of the barrels but still worth it .