It is another grey/vague area. If you brought and possessed in VA for example. It is your property. You are merely changing its location. But, what does the law say? If you sent a pistol out of state for gunsmith work. But, you had to send it with a mag, how would you do that? I don't think a g.smith would need a mag.
I'm going to err on the side of caution.
Still mulling my options and thanks to those who have offered help.