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GM-M5 16" 5.56mm NATO M4 A/R Barrel with Extension 1:7

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Product Description

16" 5.56mm NATO M4 Replacement Barrel,1:7 twist, fully machined with extension (with m4 feed ramps),  41V50 milspec, button rifled, thermo stress relieved, precision air gaged. Chromed bore and chamber for optimum performance and durability. Carbine length gas block, .750" gas block, drilled exhaust port, muzzle threaded 1/2x28, Phosphated finish, weighs 1.85 lbs.  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

Showing reviews 1-5 of 18 | Next

  1. Good Barrel 5 Star Review

    Posted by on 16th Oct 2017

    Recently completed a custom build with a SOTA lower and handloaded 69 gr 5.56 Good barrel and is a tack driver. Very pleased with Green Mtn.

  2. Green Mountain Does it Again! 5 Star Review

    Posted by on 7th Nov 2016

    Service, delivery and value is what keeps me coming back to Green Mountain.

    I just completed a billet Ar-15 build and spared no expense on what components I wanted. When it came down to one of the most important features the barrel, I knew there was only one choice Green Mountain.

    Rifle shoots straight / true through to the fit / finish which is top notch. The letter showcasing their pride towards servicing their customers, shows a certain level of class.

  3. Range Report 5 Star Review

    Posted by on 2nd 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.

  4. 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.

  5. 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.

Showing reviews 1-5 of 18 | Next