Kochman, could we step back for a bit of perspective?
You have suggested something like a 4473 check for intra-state transfers amongst unlicensed individuals. This is a misapplication of the federal system.
The 4473 check system exists for the purpose of regulating federal licensees. It exists so that federal licensees do not transfer arms to legally prohibited individuals.
That system is not designed to prohibit all arms transfers to prohibited individuals. Indeed, firearms are a common item. The central problem with your proposal is that it cannot work for the end to which you put it; no law will prevent a determined criminal from obtaining a common item.
Expanding the 4473 check to unlicensed individuals burdens and an importent civil right toward no good end.