According to the study, an estimated 287,400 prisoners has possessed a firearm during their offense. The findings concluded 56 percent had either stolen the weapon, 6 percent found it at the crime scene and 7 percent obtained it off the street or on the black market. More than 25 percent had received it from a family member or friend.
About 1.3 percent of all prisoners obtained a gun from a retail source and used it during their offense, the study stated. Moreover, among the prisoners who possessed a firearm during their offense “0.8 percent obtained it at a gun show.”
https://www.foxnews.com/us/new-doj-s...tores-or-shows
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My interpretation of "got it from a family member or friend" is that most either stole it from a family member; or friend or family member is a fellow criminal.
So in other words, the "gun show loophole" is substantially oversold.