14.5" M4 Replacement barrel for mid length gas system, 5.56mm 1:7 twist, 4150, chromed bore and chamber, 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 1.7 lbs.
Posted by SSgt82-02 on 21st Dec 2016
I wanted an AR for a truck-gun that was short that did not require another NFA stamp to keep track of and didn't require permission to take across state lines from the ATF. After it was tested on one of my SBR lowers I pinned one of my QD suppressor mounts on to give it a 16+" overall length then topped it off with an Aimpoint M4 optic. Thanks GM it's the 3rd barrel I've used in a build but not the last.
Posted by Unknown on 2nd May 2016
I used this barrel for a recent build. Fit and finish was perfect and I was able to get sub MOA with cheap factor ammo! I highly recommend this barrel. Green Mountain is now my go to barrel company!
Posted by Randy T. on 10th Mar 2016
This barrel with the Smith Enterprise muzzle brake permanently attached Is the best grouping[carbine I own with 62 gr & 72gr. ammo both commercial and hand loads. Perfect quality and finish for the money , but that's what you get with GMB products , Thank you, Randy T,
Posted by CB Massachusetts on 29th Jan 2016
I purchased two of theses barrels and installed them with no issues. The finish is very nice, bore is nice and bright, and most of all they shoot great.
Posted by Ray on 19th Jun 2015
This my second barrel, came as pristine as the first, im mounting a permanent 2" flash supressor, to be legal length, the chrome inside chamber and bor e is flawless in apearance, id buy another and recomend to ANYONE. best barrel for your buck.