Sup /k/, I want to commercialize a homebuilt rifle design that

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Sup /k/,

I want to commercialize a homebuilt rifle design that I came up with, which uses mostly common parts. I'd want to ship the 80% receivers (really more like 50%) and a couple of non-receiver parts that are nonstandard. Thing is, I'm living outside the U.S. for now and would want to ship them to the U.S.

Since these are unfinished gun parts, are there any U.S. laws that I would need to deal with? Or would import regs only apply to gun parts? If I were to finish any of the non-receiver parts, would those have to comply with any regs or shipping laws just because they are "gun parts"?

Also, what is the process for getting ATF approval for a design, and for determining which part is "the receiver" that (if it were finished) would need to be marked?