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GM-M9 16" 5.56x45mm 1:9 Twist


Product Description

  • Caliber- 5.56x45mm
  • Twist Rate- 1:9
  • Length- 16"
  • Profile- M4 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- 41V50
  • Thread Pitch- 1/2x28
  • Weight- 1.80lbs

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Product Reviews

Showing reviews 1-5 of 33 | Next

  1. Buy this now 5 Star Review

    Posted by on 2nd Aug 2020

    Fantastic barrel, No reason to buy the more expensive “big name” barrels!
    I went to my gun range this morning and shot multiple 3/8” 3 shot groups at 100 yards with Hornady black 62 grain. Hornady frontier 68 grain bullets had about 3/4” groups. Tried 55, 62, 68, 75 & 77 grain bullets today.
    This is my 3’rd Green Mountain barrel, keep up the good work.

  2. Clean Barrel 5 Star Review

    Posted by on 9th Jun 2020

    I ordered this barrel because it was the same as what I have on my Bushmaster Texas Edition. I wanted something that wasn’t too heavy or too light for my current build. Something that could occaisionally handle a mag dump if needed but not weigh a ton. Overall very happy with it and will consider more in the future. GM customer service is outstanding as well.

  3. Great company 5 Star Review

    Posted by on 2nd Nov 2017

    Barrel looks great, can't wait to finish up and get to the range. Very quick delivery and great people to deal with. Thanks again GM

  4. Great company and great product 5 Star Review

    Posted by on 27th Jan 2017

    I am using it to replace an existing barrel and it went together very well. I have only put fifty rounds through it but it appears to be dead on. The chrome lining made it so much easier to clean.

  5. 16" 1/9 twist barrel 5 Star Review

    Posted by on 12th Dec 2016

    Absolutely awessome, best bang for the buck grouping is nice great choice you will be very happy , I know I am !!! Thank you Green Mountain!!!

Showing reviews 1-5 of 33 | Next