Apparently, in 1999, after the Columbine school shooting, the NRA supported universal back-ground checks for all gun purchases. They said it was a reasonable position.They actually bought an ad in USA Today, which said: We believe its reasonable to provide for instant background checks at gun shows, just like gun stores and pawn shops.
Here’s the link to a Salon.com article, which contains a number of links to background articles. The NRA once supported background checks.