Read this article in American Rifleman magazine this month. Very ingenious of Mossberg. This model seems to be a great option for many applications. Too bad they couldn’t make a retrofit kit for standard M500 pump guns. I would convert one of mine to be able to get the load flexibility.
The article outlines a number of changes to the bolt, trigger group and elevator that might preclude easy retrofitting, IMO. They don't say if the receiver is different...