18 1/2 barrels are not that expensive but if your dead set on hacking it Id put masking tape on it then very slowly cut it off with a pipe cutter then file it true.
Pipecutter will not turn all the way around a vent rib barrel. Plus it will put a slight taper to the inside of the barrel, which will have to be reamed.
Plus, not all barrel bores are centered. One side may be thicker the the other. it needs to be miked to see how thick the wall thickness is if you plan on having it threaded for choke tubes.
They make different thickness tubes and different thread count.
I want to cut my mossy barrel badly but i lack the tools to do so.
Buy a new one from Midway or Brownells and sell the old one here to make most of your money back. That's what I did.
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