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GM-M21 16" 9MM barrel with a 1:10 twist


Product Description

9MM, 1:10 twist, 16" long, 41V50 steel, weighs 1.55 lbs., black nitride barrel, Full Auto chamber, button rifled, air gauged, stress relieved, threading is 1/2 x 36. 

Barrel is not pinned for front site base or hand guards.

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

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Product Reviews

  1. Great after sight in 5 Star Review

    Posted by on 17th Dec 2018

    I bought this during the Black Friday sale. I haven't done any extensive testing on it, but since pistol barrels tend to last forever, I'm not too worried.

    It is shooting a 3" group at 50 yards with plated bullets and no accuracy testing. It also will feed TC bullets, which is a plus over a barrel that needs round nose bullets to feed. The rifling looks clean and the finish is clean and evenly applied. Couldn't be happier.

  2. Great barrel. 5 Star Review

    Posted by on 17th Feb 2016

    Purchased the barrel to build a suppressed 9mm AR. Barrels proved to be accurate and we'll made. I am becoming a fan of Green Mountain barrels having bought quite a few of them.

  3. 9mm barrel 5 Star Review

    Posted by on 5th Jan 2016

    very nice quality barrel
    good groups 147gr rn
    16" barrel with linear muzzle brake sounds like a 22lr
    love it
    nice tight fit

  4. good barrel 4 Star Review

    Posted by on 13th Dec 2015

    Overall quality is excellent, got some very good groupings with 125gr JHP slugs, wish they did a 10" barrel for a pistol build. But would buy again