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GM-M8 16" Mid Length gas system 5.56 mm

Calculated at checkout

Product Description

5.56mm, 1:8 twist,16", 41V50 steel, weighs 1.9 lbs., mid length gas system, chrome line bore and chamber, phosphate finish, button rifled, stress relieved, 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.

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

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Product Reviews

Previous | Showing reviews 6-10 of 62 | Next

  1. Tack driver 5 Star Review

    Posted by on 23rd May 2017

    After getting the muzzle break set, this rifle shoots sub 1/2 minute. Both 69gr sierra match and 55gr SP shoot amazingly tight groups.

    Never have had an issue with GM barrels.

  2. Its damn accurate 5 Star Review

    Posted by on 8th May 2017

    Found this barrel after hunting all over the net. The price was great and installed on my first AR build. I took it out to the range for the first time and after I got it sighted in, amazing 1-1.5" groups appeared on my targets. I started another build for my kid and will be purchasing another Green Mountain barrel for their build.

  3. Excellent barrel 5 Star Review

    Posted by on 30th Mar 2017

    The fit and finish were excellent when I unpacked it, the chrome lining is very nice and the barrel extension is of excellent quality and has m4 feed ramps that indexed perfectly with my upper. I can shoot about 1 MOA with a 3x magnifier on my Micro T2, with a scope I would expect .5 to 3/4 MOA. Overall the barrel is excellent and is right on par with my BCM and Spikes Tactical barrels. The quality difference between the BCM and Spikes Tactical barrels are non existent and they are made from the same correct mil-spec materials and the chrome lining in them is of the same quality, fitment on the upper is the same and the only difference is price. I would definitely buy these barrels again.

  4. 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.

  5. 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!

Previous | Showing reviews 6-10 of 62 | Next