On Sun, 15 Feb 2015 14:32:46 -0500, Abit Loco
wrote:

I have heard that 'gun parts' can be shipped through USPS and UPS. Don't know for
sure though.

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I've heard the same thing and "machine parts" or "tool parts" are no
issue at all (hint). I was recently in touch with a well known custom
shop and they recommended Fed Ex with a machine parts designation.