5.56 Black Nitrided US 16" Barrel 1:7 twist 4150V Steel *AKM Config 23mm* by Green Mountain Rifle Barrels w/ Gas Port


Temporarily out of stock, more arriving soon!

(2 reviews) Write a Review

5.56 with 1:7 Twist. They are Made from 4150 Chrome Moly steel and black nitrided inside and out , Gas Port is drilled. The handguard retainer slots and extractor clearance cut is already in place.

These barrels are 23mm and AKM Config so they will take most of the standard AKM parts. A perfect match for the WBP 5.56 parts kits! Made By Green Mountain Rifle.

Thread and cutting options:

We now recieve barrels pre-threaded for 1/2 x 28!
16" Non-threaded barrels and 16" 14-1LH threaded barrels have very limited quantities.

If you want a full 16" barrel with 1/2 x 28 threads, there is now no extra work needed and no additional charge!
Any additional gunsmithing service will add up to an additional +1-3 week lead time.

Choosing a short barrel cutting service and threads will require us to re-thread the barrel, so there is additional cost involved with a barrel ordered with these options.


  • 5
    This barrel will work with front site/ gas block combo

    Posted by Wayne Miller on Mar 16th 2022

    I originally assumed that I was going to have to get a 90deg gas block front site, because the WBP one is a 45 degree: it works out perfectly with the WBP 556 kit. Very nice barrel.

  • 5
    5.56x45mm barrel

    Posted by Niki S. on Nov 28th 2021

    Barrel is very well made and all journals are within spec of AKM barrel dimensions. I really like how the chamber side is chamfered to aid round chambering where I had issues with another brand barrel without this feature. Highly recommended.