Getting your "facts" from anti gun sites I see. They lie, distort facts and just make shit up. There is no way that 22 percent of all firearms sales conducted legally in the States is private sales.I can't accept your evidence in the face of more reliable evidence.
Universal Background Checks
Without universal background checks, millions of guns end up in the hands of individuals at an elevated risk of committing violence.giffords.org
And the reference to 45% appears to suggest that we up the ante from 22% to something much larger.
Are we now going to have to frame the word 'illegal' in the sense of that which is mentioned in that link?
I have to suggest that legality becomes a moot point in light of the number or guns that are sold with no background checks.
(see my question to 2A on the confiscation of guns from those who have committed no crime with their illegally procured guns)