Showing reviews 1-5 of 7 | Next

1. I would give it 6 stars

   Posted by mtnforge on 14th Sep 2018

   What an upgrade! Only drawback was I didn't get this 5.56 chambered blank sooner. Dialed this barrel in at .0002" on the lathe, gave it an 11 degree crown as cut, no polishing, left the diameter of .900" behind the gas block, with .250 deep cooling fins. I never shot such an accurate rifle, its scary, and this is my go to combat carbine. The confidence factor of hitting what I'm aiming at this barrel gives me is off the charts.
   I don't know what these guys at GMRB are doing, whatever it is, its the best kept secret in barrels out there.
   Get one, whatever it takes to dial in runout close to zero as you can, you will be very happy.
   
   Now I can't wait to build an AR10 with the 7.62 chambered blank.

   ---

2. 1st Rate

   Posted by mtnforge on 28th Apr 2018

   These chambered AR15 blanks rock. Sweet turning, insane accuracy.
   Machined one of the 300BLK chambered blank. Built a carbine with an A2 full stock, handles like a dream. It is so accurate with iron sights I bagged 2 deer at 200 yards, first and second round I shot after sighting in. After that I am so pleased I'm converting all my AR platforms to use a barrel turned from a GMRB chambered blank.
   

   ---

3. A real cost saver

   Posted by Frank Vigneau on 4th Nov 2015

   These barrels are great for custom work and the price is right for keeping costs down for my customers. Because they are already chambered, l can concentrate the cosmetics and special features of my customer's choosing.

   ---

4. Good stuff

   Posted by Bryan Sheriff on 11th May 2015

   Turns like butter, provided you don't try to take a <.005" cut. Finished very nicely with a 120 grit roll and scotchbrite. Chamber and bore are right on. Minimal work to produce a very accurate-for-the-money barrel.

   ---

5. hard to beat

   Posted by Dan M on 30th Apr 2015

   These half done barrels are hard to beat. Chrome lining is great. Chambers are really good. The only thing I would change is not having the step in them.

   ---

Showing reviews 1-5 of 7 | Next

• 
  GM-B3 17" Gunsmith Edition with a nickel boron extension and chambered
  $143.95
  OUT OF STOCK
• 
  GM-B2 21" 5.56mm Gunsmith Edition blank with a phosphate extension
  $134.95
  Add To Cart
• 
  GM-B4 21" .223 Wylde Gunsmith Edition
  $147.95
  Add To Cart