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GM-M16 20" M16 A2 5.56mm w/Ext. 1:8 twist

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Product Description

M16A2 5.56mm, 20", 1:8 twist, 41V50 steel, weighs 2.05 lbs., fully machined and assembled with extension (M4 feed ramps), chrome line bore and chamber, .750" gas block, designed for rifle length gas system, drilled gas port, phosphate finish,button rifled, air gauged, stress relieved, muzzle thread 1/2 x 28.

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

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Product Reviews

Showing reviews 1-5 of 29 | Next

  1. what i expected and more ! 5 Star Review

    Posted by on 1st Jan 2018

    I have had green mountain barrels on black powder rifles for a long time and was in need of a barrel for my new AR build . So I turned to green mountain and couldn’t be happier . I shot it today and this gun is a tack driver ...... if you are in need of a great quality barrel this is the one for you !

  2. accurate 5 Star Review

    Posted by on 31st Aug 2016

    Where the bullet meets the target is all that matters! 3/4" @ 50yds with stock iron sights and my eyes are not that great. Some of the best groups I've ever shot.

  3. Nice barrel 5 Star Review

    Posted by on 19th Aug 2016

    Barrel fit perfect. No headspace issues. Barrel has about 30 rds through it so far and is shooting sub moa at 100 yds with factory ammo. Great barrel fort the money no doubt!

  4. super 5 Star Review

    Posted by on 13th May 2016

    was my first AR build and could not be happier with the barrel

  5. Great barrel 5 Star Review

    Posted by on 20th Apr 2016

    Bought this barrel for my latest rifle build. Definitely beats the barrels that come with cheap 2-300 dollar uppers. The chrome lining looks good. after breaking the barrel in it was shooting 1 1/4" groups at 100yds. superb for a barrel that is chrome lined and at this price. The 1/8 twist will handle a range of bullet weights and does very well with 62gr.

Showing reviews 1-5 of 29 | Next