What SPECIFIC loopholes have been used by mass shooters in the USA to acquire firearms?

HereIbe
Okay, a bunch of inbred mouth-breathers are bleating that there are "loopholes" in background checks for firearm acquisition that must be changed to prevent more mass shootings. WHAT ARE THESE LOOPHOLES! Give specifics on a case-by-case basis. Cite the relevant legislation sections. Show how that loophole was used.

You will all fail. But you're free to try.
What SPECIFIC loopholes have been used by mass shooters in the USA to acquire firearms?
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