Thread: MAZOC Firearms
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Old 12-19-2011, 05:45 PM   #859 (permalink)
MacCool
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Quote:
Originally Posted by TROOPER View Post
I had the compensator/muzzle-break pinned, not the gas block, so I didn't have to pay the ATF any money for having a SBR

Anyway I'm sure I'll get the gas problem fixed next week
Ah.

IMHO, the gas block should always be pinned. In addition, the barrel should always be dimpled for at least one of the two set screws on a typical gas block. If these things aren't done, the gas block can rotate or slide forward when the set screws come loose (and they will), in which case the gun won't cycle. My fear about a local gunsmith doing the gas block pinning is actually pinning it partially rotated - more likely if he doesn't have the proper jigs for that particular barrel. This is even more of a problem if the barrel isn't factory-dimpled, which will index the gas block exactly vertically so the gas port in the barrel aligns perfectly with the hole in the gas block.

I tend to send my barrels for this kind of gunsmithing to either ADCO, AR15 Barrels, or Rainier. You might have great gunsmiths in your area (I don't, but given your experience, I'm not sure you do either). My local gunsmith is a friend and a great guy, but this kind of stuff isn't in his skill or tool set. But the companies above all do excellent work, and the barrel and gas system is such a critical part of the functionality of the rifle that that's where I have the work done.

Last edited by MacCool; 12-19-2011 at 05:55 PM.
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