User blog comment:Lord Loss/Monster Hunter Frontier G 3 Discussion/@comment-24148207-20131115082807/@comment-11685710-20131115091914

I think you can change your weapon just like in any other MH game.

BUT there's something, tzat's called "skill rank" (hope I'm not mistaken again..), that's for specific weapons and additional weapon moves iirc. I can't tell you too much about that, because I'm not able to play it on my own - mainly because of the lack of any japanese skills and me not wanting to pay monthly for a game, I most likely won't play too regularly - I'm a MonHan fan, but not one of those, who's playing it for hours/days - but I'm quite interested in all the mechanics and I hope it's enough to answer your initial question.

If you've got any more specific questions, I'm sure that someone, who's playing Frontier will tell you the other stuff ;)