Can i assign a variable to a mesh instance of a model, the use tween on the mesh instance? 
if so this would be awesome for what I’m trying to do
and what are you trying to do?
Using a gun model for my fps game, to use tween to move part of the weapon mesh, like the bolt, move it back like a real gun, so I don’t have to add an animation, just a bit of code that takes less data
you’d want your gun exported using hierarchy, the way that each moveable part is a separate entity. And then you simply move (tween or animate or drive by the script) the translation of the entities as you need.
How would i export it? Because apparently I can’t just tween the mesh instance the way it is
Maybe I can just mask a separate model over it, but that wouldn’t look good