Well finally got around to weapon retopo.
I probably went about it the hard way, of course!
I retopoed every piece at the mirror symmetry line. So both sides of every object are mirrored and split at the center.
Actually a couple parts left(main housing needs to be done in Blender 3D, it's like a cave and auto-po can't handle it.).
Now I have to line up loops and join seams.
Does anyone actually import weapons in separate pieces like that(but joined as one, except animation parts)?
It would work but I don't know how acceptable it is, or actual problems with it.
I probably should have joined some continuous parts and retopoed, would have saved time actually.
Well it was good practice retopoing different shapes anyways!