I took a quick look at the MPA 10. It looks like a straight blowback? Might be a candidate for upgraded springs ;^) I would be worried with straight blowback of possibly blowing a casehead.
There is a vid of one chambered in the Rowland so I figure the Super should work. Not sure of the specfics. I think it would make a great little night time high cap pig hammer. I can drill my 50 yard berm in total darkness ;-)
