But who is going to buy a Lever that takes mag just for that purpose? Everybody wants semi autos. And why isn't there more bolt action 9mm rifles? Again everybody wants semi auto. Seems like only 1 person wants a mag fed 9mm lever, everybody else wants a classic side loading tube fed.
If they are good at making tube fed, why change it? Also it would be a totally new design and very costly. Let Mossberg make ugly rifles.