Loading... Please wait...

Like Us on Facebook!


Add to Wish List

Click the button below to add the GM-M15 20" M16 A1 5.56mm 1:12 twist to your wish list.

You Recently Viewed...

GM-M15 20" M16 A1 5.56mm 1:12 twist

Your Price:
$150.41 (You save $26.54)
Calculated at checkout

Product Description

5.56mm, 1:12 twist, 20", 41V50 steel, , weighs 1.75 lbs., fully machined and assembled with M16 extension, chrome line bore and chamber, drilled gas port, phosphate finish, button rifled, air gauged, stress relieved. 1960s era pencil profile, muzzle threading 1/2 x 28.  

Barrel is not pinned for front site.

Under "See 1 more picture" there is a detailed drawing of this barrel. 

Write your own product review

Product Reviews

Previous | Showing reviews 6-10 of 67 | Next

  1. Great Product ***** 5 Star Review

    Posted by on 11th Apr 2017

    While looking for a barrel for my M16 retro build I ran across an ad about a guy who bought one of GM 20" barrel, he compared it to one of his Colt built barrels and said the Green Mountain looked to be a better made barrel. All though I'm no expert the 20" Green Mountain barrel I bought is well made.

  2. A well made barrel 5 Star Review

    Posted by on 1st Feb 2017

    Wanted to build a retro A1 Vietnam style AR and was happy to find the barrel I needed for my project at Green Mountain. Authentic, well made and accurate too.

  3. Excellent product 5 Star Review

    Posted by on 30th Jan 2017

    Recently purchased an A1 barrel for a retro build. Outstanding service and barrel looks and performs great. Installed on my old Colt kit with no problems. Highly recommend Green Mountain to anyone looking for a quality product at a fair price.

  4. M18 Barral 5 Star Review

    Posted by on 25th Jan 2017

    I am probably one of the few people who have a NOS M16 surplus barrel, had it for over 20 years. The Green Mountain Barrel I just received is not just a Repro., it is a far more high quality part which makes the original Colt barrel look not so great as it did before! The GM barrel has nicer machining and most likely is the same as the first production M10 barrels where. The Chrome bore and rifling could be no better. The price is very low for a part so nice.

  5. Great Product 5 Star Review

    Posted by on 25th Jan 2017

    Was so happy to find this barrel to complete my M16A1 build. Turned out great and barrel was spot on and perfect, only thing that would make this the ultimate would have a pinned front gas block. Was able to buy a set screw front gas block to complete the project. But all in all great barrel, great company.

Previous | Showing reviews 6-10 of 67 | Next