Loading... Please wait...

Like Us on Facebook!


Add to Wish List

Click the button below to add the GM-M41 12.5" 300 Blackout AR15 barrel 1:7 5R twist to your wish list.

You Recently Viewed...

GM-M41 12.5" 300 Blackout AR15 barrel 1:7 5R twist

Calculated at checkout

Product Description

300 blackout, 1:7 5R Twist, 12.5" long, 41V50 steel, weighs 1.2 lbs., AR15 barrel with a button rifled, stress relieved, air gauged.

Features include a Pistol Length, .750” diameter gas system, a chrome line bore and chamber, phosphate finish, Fluted taper, assembled extension with M4 feed ramps and 5/8-24 muzzle threads.

Write your own product review

Product Reviews

  1. another greeen mountain great 5 Star Review

    Posted by on 30th May 2017

    I was bit hesitant with no reviews but this barrel had all the attributes I was looking for. 1/7, 5R, lightweight, attributes you would normally find in a much more expensive barrel. Don't care for the slight taper but it doesn't seem to affect accuracy. With a red dot and bad vision I was able to get right under 1 moa at 100 yds with American eagle 150 grain fmjs. The fluting and finish is top notch as usual with green mountain barrels. If your looking for a 300 blk barrel that's under 16" and can still give you 2300-2400 fps with supers accurately this is your barrel. If I could change one thing I would tell green mountain to get rid of the taper and keep it a consistent diameter beyond the gas block. Further testing with chrono and 120 grain supers to come. Thanks again green mountain for a great product