Hm, it really is almost exactly the same… Sorry, but I still don’t see what’s wrong… Have you made any important changes to the PickableObject class? And do you experience the same problems with adding any other kind of objects inheriting from the PickableObject class? Like boxes or whatnot?
It seems like the problem is either in the Firearm class or the PickableObject class. I guess we can exclude the first one (well, frankly it was the less likely option since the error occurs in the setupGeomAndPhysics method).