This would be for Russian surplus 7N6 corrosive 5.45x39. I guess eventually the gas tube would rust weld to the gas block further ensuring a stable Ultimak mount.
I run hot water down the gas tube and block, so should I get the Ultimak this wouldn't change. I think I got my 12GA chamber brush with handle through a 7.62 gas tube no problem.
Guess I'm trying to talk myself into the Botach H-1 discount deal.
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