That information was from MSNBC in the article that on the NRA. Those numbers are not the NRA's.

The ban expired in 2004 and weapon sales have increased significantly since that time. If the amount of guns on the street directly or indirectly correlated to an increase in murders, then the murder rate should be much higher than before the ban.

After the ban ended, from 2007-2012 there were over 77 million applications processed to purchase guns in the US. In excess of 10 million per year. Wouldn't this have led to a greatly increased murder rate? Well, it didn't, so the anti gun folks are wrong when they say the availability of more guns leades to a higher rate of murders.

I am a pro gun person, provided that they are used responsibly.