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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. 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.

  2. 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.

  3. Barrels that sell guns 5 Star Review

    Posted by on 24th Feb 2015

    We are a small MFG and rely on great top notch barrels that won,t break the bank. I also shoot amateur 3 gun and the 223 wyld is head to head with my expensive $450.00 barrel. We find these barrels to be the best kept secrete in barrels. Try them you will wonder why others want so much.
    Owner Tactical Art Co.

  4. perfect 5 Star Review

    Posted by on 15th Feb 2015

    Great finish it if perfect in my upper installation was a breeze looked it over couldnt find any inprofections at all looked great. Great product

  5. I have purchased several 556 barrels and am totally satisfied 5 Star Review

    Posted by on 11th Feb 2015

    I build custom guns and barrels are one of three components we are very particular in choosing. they must match purpose and be highly accurate with quality and value for the buck as a consideration in choosing.Green Mountain Barrels has sold some of my firearms. My Clients were impressed when visiting their web site and agreed to my suggestion for a barrel.

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