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The only one that comes to mind is Jess Briley's shop, their top of the line Skeet tubes are rifled. Perhaps they could do your gun. The only rub is they are straight rifled, and I assume you want some twist.
Typically, twist rifled slug barrels are intended to be used with sabots, but I'm not familiar with any .410-bore sabots. Do you intend to make your own .410 sabots, or what? You may be crossing the vague line between a rifled shotgun and a true rifle.
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