If the exterior of the barrel is straight then it's not bent. The bore of all drilled & button rifled barrels will have some bow or bend to it, it's just the nature of the process, and smaller calibers are more susceptible due to the smaller diameter bit being able to flex more easily. Just because a bore has a bow in it doesn't mean it won't shoot well - in fact I've seen some pretty impressive groups shot from bores that had significant bows in them.
First thing I would do is take it out and shoot it. If it has adjustable sights, sight it in at 25 yards and then pattern the shotgun barrel to see where the regulation is.
More than likely you'll be worse off if you try to straighten the bore.
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