Most barrels have a taper from the breech to the muzzle - trying to really cut them square and true is difficult without the right jig and tools. Yes, you can take a hacksaw and bubba the job, take a sharpie and call it good, or you could do it right.
It might be easier and cheaper, in the long run, to have someone do it right or buy one made in the configuration you want. As to the barrels, some are held together by silver solder, some by regular solder. Odds are the cheap Baikal isn't held together with silver solder. Overheating the barrels and not doing it right can result in one barrel shooting one place and the other shooting someplace completely different
Your choice to decide and make
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