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GM-M37 16" Stainless Steel M4 for Mid Length gas system 5.56 mm


Product Description

5.56 mm, 1:8 twist, 16" long, 416 stainless steel, weighs 1.9 lbs., replacement barrel for  mid length gas system, button rifled, stress relieved, air gauged, gas ported, and assembled with an extension with M4 feed ramps, muzzle threading of 1/2" x 28".

Barrel is not pinned for a front sight base.


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Product Reviews

Showing reviews 1-5 of 17 | Next

  1. Never give a top score to anything because ... 4 Star Review

    Posted by on 13th Sep 2019

    You don't know about or have the ability to try everything out there. This build is to an individual who has one I built with this barrel, and there are 5 others including one I have, and this barrel was chosen. This barrel shoots to expectations ie 1 MOA or less depending on the load and the individuals capabilities.

  2. Top Quality and Accuracy!! 5 Star Review

    Posted by on 27th May 2019

    These barrels are fantastic! Great price and outstanding accuracy!! I’m an avid 3 gunner and these are the only barrels I buy. I’m getting 1/2 MOA from all the barrels I’ve purchased, so I’m sticking with what works. I shoot a lot, in fact I always bring 2 identical rifles during training so I can switch them during drills and courses of fire; I don’t like getting them too hot. They don’t last forever, so I just order a new one when accuracy degrades.
    Thanks Green Mountain!! :)

  3. will buy from green mountain again 5 Star Review

    Posted by on 18th Sep 2018

    Barrel shipped immediately, looks great, and accuracy is excellent. Very happy with purchase

  4. Another great barrel from GM 5 Star Review

    Posted by on 16th May 2018

    I've purchased 3 of these barrels in the past 2yrs and each has met my expectations. I build AR's for varmint shooting and a quality barrel is a must. From a bench I'm getting 1" groups @ 200yds using Hornady's SuperPerformance Varmint 53gr V max ammo. Running X193 ball ammo my groups open up to about 1.5" at 200yds.
    GM is quick to ship, packaging is on point and I'll continue to buy GM barrels.

  5. if you do your part, you will out perform most barrels out there 5 Star Review

    Posted by on 16th Dec 2017

    Had great results with standard ball ammo. Cheap gecco ammo at moa and sub moa at 100 yards. With black hills and razor core match ammo I shot as good as I did with pmcxtac 62 grain at least at 100-250. Ringing steel was child's play out to 700 yards

Showing reviews 1-5 of 17 | Next