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GM-M20 20" 223 Wylde Chamber

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Product Description

223 Wylde Chamber, 1:8 twist, 20" long, 416 stainless steel, weighs 2.20 lbs.,  Fluted, honed, button rifled, air gauged, stress relieved, passivated, bead blasted matte finish,  Nickel Boron extension with M4 feed ramps, and has a rifle length gas block. 

Barrel is not pinned for a front sight base.

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

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Product Reviews

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  1. Quality is #1 with these barrels 5 Star Review

    Posted by on 2nd Apr 2018

    As a small custom rifle manufacturer I have used several of these barrels. Every time I am impressed by the quality of the Chamber, bore and crown. Group sizes with these barrels speak for themselves. Average group size with match grade 77 grain SMK is always less than .400 with the best ever of .047! That's one ragged hole! Green Mountain will always be my go to for great barrels at great prices. Keep up the good work guys!!

  2. This barrel was for a friend, hunting coyote medium range. 4 Star Review

    Posted by on 26th Mar 2018

    We have only had a range test and break in less than 20 rounds fired, cleaned it between rounds.

  3. Replace your OEM AR barrels! 5 Star Review

    Posted by on 20th Mar 2018

    Replacing a 16 inch OEM govt profile barrel with this 20" Wylde that has all one needs to reach out and touch sonething. Quality care upfront by GM means quality production on the business end for the shooter. A made in America barrel for 1/4 of the cost if mounted as part of a name brand upper. Thanks Green Mountain.

  4. Great Barrel! 5 Star Review

    Posted by on 8th Mar 2018

    Looked up Green Mountain because my Dad used one of their barrels on a muzzleloader build back in the 80's. When i saw they made AR barrels, i had to try one. After sighting in the scope, this barrel is shooting 3 round groups at 100 yards with 69gr match ammo that can be covered up with a quarter. Haven't even put 50 rounds through it yet. My skills are the only thing holding it back. Excellent fit and finish too. I'd recommend it to anyone!


    Posted by on 5th Mar 2018

    I'm excited with the quality and value of the barrel. Shoots well, cleans up easily and is a nice weight for the profile. I would recommend....

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