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GM-B4 21" .223 Wylde Gunsmith Edition Barrel Blank 1:7 Twist


Product Description

  • Caliber- .223 Wylde
  • Twist Rate- 1:7
  • Length- 21"
  • Profile- Chambered barrel blank
  • Steel Type- 416SS
  • Weight- 4.00lbs

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Product Reviews

Showing reviews 1-5 of 17 | Next

  1. Outstanding Barrels 5 Star Review

    Posted by on 20th May 2021

    I have been shooting in high power competition for over 10 years and have shot out many barrels. I have bought high end single point rifle cut barrels, and mid priced button rifled barrels. I can attest GM Barrels can perform along side with barrels costing 3 to 4 times more. The consistency and value that GM barrels bring is such that I refuse to buy from any other manufacture. GM Has made me a loyal customer for life.

  2. She's a Shooter! 5 Star Review

    Posted by on 14th Sep 2020

    My friend and I had an idea to build a highly accurate straight pull bolt rifle. To test some of our theories, we decided to build a straight pull AR bolt rifle first. Ordering the GM-B4 barrel, and slotting a DPMS slick side AR-15 upper, was the easiest way to accomplish this build. Upon receipt of the GM-B4 barrel we installed it in the slotted upper and started testing. After completing so initial load development with some 77gr Nosler Combined Competition bullets I had bought years ago, on the cheap, we had our baseline accuracy to compare our accuracy modifications to. He accuracy baseline of this barrel, installed in a AR-upper 1/2 MOA. That's right, the GM-B4 barrel, with absolutely "NO modifications," installed in a DPMS slick side upper (which was a take off from an LE officer that wanted an upper with forward assist and dust cover), is turning out 1/2 MOA, consistently. The load development still isn't complete as I am getting 35fps extreme spread over 10 rounds, but she loves 77gr Nosler CC, and 73gr Hornady ELD-M bullets seated to make mag length. Now, the question is, can we mod the barrel to make it a 1/4 MOA shooter? Green Mountain, I love your barrels!

  3. Loving it! 5 Star Review

    Posted by on 4th Feb 2020

    I purchased this barrel for a straight pull bolt project my friend and I wanted to try. Once the barrel arrived, we installed it and began testing ammo. It showed promise right off, shooting loads developed for other rifles with good accuracy. I've started load development for 77gr Nosler CC BTHP bullets as well as Hornady 68gr BTHPs. The first loads with 77gr shot right at 1 MOA at 100 yards. The 68gr loads are shooting about 0.5 MOA, and that was with every round being a different charge load, working up from 23gr to 24.3gr. I'm very excited to see what she will do once she has been fluted, had a muzzle device added, and full load development completed. I'm expecting sub 0.5 MOA, out of a $115 barrel. Thank you Green Mountain Barrels, and keep up the good work.

  4. Tack Driver 5 Star Review

    Posted by on 26th Aug 2019

    This is my 3rd barrel from Green mountain and it is outstanding. I ordered a 556. Wilde chambered gunsmith special and all I can say is it really shoots well. I use it as a target rifle side charging no gas. 5 of my first 6 targets were under 1 inch MOA this is a fresh barrel and shot excellent from the get go.

  5. Took some time to get range time 5 Star Review

    Posted by on 27th Mar 2017

    Put this together with no gas port. Single shot.
    Shows great promise with factory 55 gr.
    62 gr handloads showed MOA. Handload 75gr shows close to MOA. Now to turn for a gas block.

Showing reviews 1-5 of 17 | Next