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Mossberg sold those combo guns with the 2 barrels. We have a large sporting goods store that had them every fall on special for $279-299 before the pandemic. They always came with a cheap little no name scope. That being said, I have seen some really decent accuracy out of them with the right sabots. The Mossbergs have a slower twist rifling in the barrel. Similar to factory Remington barrels and Hastings barrels. They really seemed to do well with Hastings Laser slugs or Rottweil Laser slugs. I do not believe anyone is loading the Laser slugs commercially any longer, but Slugs R Us was selling the wads and slugs for reloading. I do not know if they still are or not. Really an effective slug on deer. I have no recommendations for slug scopes other than Leupold. Good luck.

And the porting is factory Mossberg.

 

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Yea everything is more expensive than before the pandemic. I did see mossberg offers a similar two barrel combo now with a MSRP of 5-something. So the price compared to pre pandemic is high, but post pandemic, it's not too bad.
Interesting on the porting. I do not think the current ones looked like they had the porting (that I could see in the pictures).

The last one I handled that was matt finish metal, plastic stock, combo pack gun had a ported slug barrel. I did not look at the 28" barrel to know if it is ported. That gun was purchased a few years ago.

 

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The problem with screw in rifled chokes is getting them out after firing several rounds. They keep tightening after every shot.

Never had that problem in about 30 years with a rifled choke in my slug barrel. I shoot it every year before season to check the scope and I shoot deer with it. When I was a nuisance shooter I would shoot between 30 and 40 deer a year with it for a few years and I never had the rifled choke get overly tight.