Gun Control Reform Activism

"Furthermore, about 90 percent of crime guns are traced to only 5 percent of dealers."

I don't think expanding background checks would do anything about these dealers. Dealers already have to run background checks, right?

Anyway, are these dealers doing something wrong, or are they just so big that their market share ensures they will have many "crime guns" traced back to them?

I'm not against expanding checks, I am just curious about why this stat is mentioned as an argument for expanding checks.