If Jim gets a F and a c, what does it take to get an "A"?
I can't speak for NRA/GOA, but this was the most likely causes of the ratings decrease.
McCarthy Amendment on gun show
Amendment sought to require individuals who wish to purchase firearms at a gun show to submit to a background check before they are able to complete their purchase; and require a three business day period for completion of the background check.
Dingell NRA backed amendment - voted no
Amendment defines what constitutes a sale at a gun show; requires background checks at gun shows to be completed within 24 hours; allows dealers to deal at gun shows face-to-face; and increases the penalty for those who use guns with a large-capacity magazine during the commission of crimes.
Amendment in the nature of a substitute sought to extend Brady background checks to gun shows, regulate firearms transfers at gun shows, prohibit firearms possession by violent juvenile offenders, and specify penalties for weapons transfers to juveniles and unlawful acts by juveniles