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For one I want to carry it, more concealable ; second its significantly cheaper, lastly I constantly carry into CT and I don't know the legality of carrying a threaded barrel gun their with a non resident carry permit.Four seasons lists the midsize and the 509 tactical, not sure about the MRD.
But if you are going to put a red dot on, why not go full sized?
I see it at a good price with 10 rounds on big daddy unlimited.FN 509 midsize MRD is readily available through distribution right now (first one I looked at had 76 in stock) I only see SKUs for a model with 15rd magazines so the dealer would have to sell w/o or swap or otherwise finagle. It should be possible to get one if you have the right dealer.