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GM-M6 Fluted 16" 5.56x45mm 1:7


Product Description


  • Caliber- 5.56x45mm
  • Twist Rate- 1:7
  • Length- 16"
  • Profile- Government Fluted Under "See 1 more picture" there is a detailed drawing of this barrel.
  • Finish- Chrome Line Phosphate
  • Gas System Length- Carbine
  • Gas Block OD- .750+-(.001)
  • Steel Type- 4150
  • Thread Pitch- 1/2x28
  • Weight- 1.70lbs

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Product Reviews

Showing reviews 1-5 of 26 | Next

  1. As always with Green Mountain, Great Value! 5 Star Review

    Posted by on 7th Dec 2020

    I Finally got to test shoot this barrel, It is way more accurate than I am. Very accurate right out of the box. Green Mountain is my go to Barrel!

  2. Always a great product 5 Star Review

    Posted by on 19th Mar 2019

    Ive ordered many barrels from Green Mountain, as always a wonderful product with great shipping.

  3. Excellent barrel 5 Star Review

    Posted by on 14th Mar 2018

    This is my second one need I say more?

  4. very accurate 5 Star Review

    Posted by on 24th May 2017

    Purchased this for my wife's build last year, after some teething problems with the buffer and spring got it working perfectly, the gun weight's about 6lb with scope and bipod, consistently shoots 1/2 moa @ 100 yards, even thought it is fluted accuracy doesn't change. PS: whish they had one in 6.5 Grendel.

  5. A Great Barrel 5 Star Review

    Posted by on 8th Feb 2017

    I purchase GM barrels and will continue to do so. Great customer service and a quick shipper. Wish they would produce AR308 barrels.

Showing reviews 1-5 of 26 | Next