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GM-M8 16" Mid Length gas system 5.56 NATO

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Product Description

16" Replacement mid length gas system, 5.56mm NATO 1:8 twist, 41V50, chromed bore and chamber, phosphate finish, button rifled, thermo stress releived, precision air gauged, gas port, assembled with M4 extension with M4 feed ramps, muzzle thread 1/2 x 28.  Barrel is not pinned for front site. Weighs 1.9 lbs.

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

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Product Reviews

Showing reviews 1-5 of 54 | Next

  1. Great Combination of Quality and Price 5 Star Review

    Posted by on 12th Mar 2017

    This barrel is for a rifle I built for my son. It is the 5th or 6th Green Mountain Barrel I have purchased. There is a reason I kept coming back - good service and great products. This particular barrel zeroed quickly @ 50 yards. My son put the last 5 shots into a group the size of a quarter with one called flyer from a rest. Spent the rest of the morning having fun without a booble. Pretty much what I've come to expect from GMB's.

  2. High Quality 5 Star Review

    Posted by on 20th Dec 2016

    I'm happy with the two GM-M8 bbls as well as the SS bbl that I've purchased from GM. 1" groups with standard PMC 55 gn ammo works for me! Most companies don't even manufacture barrels. They slap their name on it and raise the price double the price of the GM barrels. I was impressed by the quality of the bbl. The chrome chamber had a mirror finish! I'm telling my buddies to buy GM and save their money on all the "tacticool" hype barrels. Great customer service too. Thanks guys!

  3. Great Product Great Price 5 Star Review

    Posted by on 23rd Aug 2016

    The accuracy of this barrel is phenomenal, price point is excellent and is definitely up to par with High priced barrels. Excellent quality barrel for a great price.

  4. G-M8 mid length rifle barrel 5 Star Review

    Posted by on 5th Aug 2016

    This Barrel was purchased for a personal build and sits on top of a Bravo Company lower, the barrel head spaced to my Windham bolt perfectly with Clymer Go/No go gauges, and the Gas block fit perfectly as well. I have yet to take it to a range but the quality was excellent, shipping was quick.

  5. high quality 5 Star Review

    Posted by on 1st Aug 2016

    Can't beat the quality and the price. I've used Green Mountain barrels for 2 AR builds, accurate and well made. I'll be ordering again soon. Thanks GM.

Showing reviews 1-5 of 54 | Next