It seems that Pakistani laws state you need a special permit for a machine gun, but says nothing about an SBS. Only shotgun related law states it can't be bigger than 12 gauge. So I'm guessing they have no hangups about barrel cutting, but don't quote me. Check your laws.
Anyways, as stated already, a lathe would make the smoothest cut. If you use a chop saw or hand saw, make sure to debur the cut both inside and out.
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