Well, I don't know about you, but I have a personal hate for weapons with animated hands.
In first person it looks meh, but in third person it looks damn awful.
I just reccomend doing something like Tier Tactical did: Blockhead wields all of the weapons in one hand, and that not only makes him look badass, but fixes a lot of other problems and you don't even have to animate the model itself. You can do the reload animations using existing blockhead ones.
All I'm saying is, you should look forward to getting rid of hands. Imo, they ruined your weapons.