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GM-M5 16" 5.56mm AR Barrel w/Ext. 1:7 twist

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Product Description

5.56mm,1:7 twist,16",  41V50 milspec, weighs 1.85 lbs, fully machined with extension (with m4 feed ramps). Chrome line bore and chamber. Carbine length gas block, .750" gas block, drilled gas port hole, muzzle threaded 1/2x28, Phosphated finish,. Barrel has been button rifled, air gauged, and stress relieved.

Barrel is not pinned for front sight.

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

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Product Reviews

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  1. Range Report 5 Star Review

    Posted by on 1st May 2016

    This is the second barrel I've bought from here. Fit and finish was outstanding as usual. Install was simple and interfaced perfectly with an Aero Precision upper and a YHM Diamond FF.

    The accuracy of this barrel was mind blowing for the price. Grouping was done at 25m. M855 produced groups that were tight enough that you could just barely see the individual holes. I then ran some Berger 55gr hand loads. Those repeatably produced groups that looked like single ragged holes.

  2. Perfect, as expected 5 Star Review

    Posted by on 9th Mar 2016

    I debated for weeks and weeks about what to do for a barrel for a new rifle that I was building. I wanted the best, but I'm retired and "best" has to be tempered by "affordable". I looked at everything and finally selected Green Mountain bas d on reputation and word of mouth at the range. I am not disappointed. The barrel is simply perfect. It's attached to Midwest receivers and foregrios and a Geisle trigger. It shoots 2 inch groups at 100 yards. It shoots way less than 2 inch groups if it's in a sled and somebody but me is shooting it. This is first rate quality and first rate service from Green Mountain. If you're on the fence - get off and order in of these. Good stuff.

  3. The best 5.56mm shorty bbl. 5 Star Review

    Posted by on 10th Nov 2015

    I don't often build shorty's , but these are the only choice for a proper 5.56mm build.

  4. Best bang for the buck 5 Star Review

    Posted by on 20th Mar 2015

    Excellent fit and finish. Headspace was good (checked with go/no go gauges). The thread protector was a nice touch. Accuracy in the 1.5" range with Federal XM-193 and a red dot/3X magnifier at 100 yds.

    I have a few more builds planned and you can bet I'll be using Green Mountain barrels.

  5. Excellent product 5 Star Review

    Posted by on 6th Mar 2015

    I just returned from a tour overseas, and some of my buddies and I got to together for an AR build party. As the armorer for my company I figured I would spearhead the operation and ensure that all of there rifles were assembled correctly. I will only use GM barrels, so naturally we all purchased barrels from GM. The barrels came wrapped up tighter than Fort Knox, even though I was cursing your shipping dept. for the miles of bubble wrap and and acre of tape on the box, I really appreciated that the barrels got to my house without issue.. The chrome lining was perfect and the phosphating on the exterior was clean and even. I also really like that all of your barrels ship with the rubber thread protector. Overall I have built 9 rifles with a mix of your 1/7 and your 1/8 barrels, and everyone has headspaced correctly and all are achieving 1.5 moa or under if we do our part... Overall these are excellent barrels.. One suggestion, If buying multiple barrels at once would like to see a "multi-barrel discount" Great work GM! you keep banging em out and I'll keep buying em.

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