If you can ship a slide assembly by UPS/FE, and it not be considered a 'firearm', is it safe to assume the same thing applies to the frame? I'm considering sending off my P30 frame for a spring change, and sending just the frame would save a LOT on insurance, since my slide assembly is all NP3, and the general shipping would be pretty cheap. (assuming the smith will agree to receive it this way for the work?)