Thirty percent of AK-47 assault rifles seized have been modified to become fully automatic. He said about three of every 1,000 AR-15 assault rifles have been modified to take .50-caliber bullets, the kind of high-powered ammunition designed for sniper rifles.
The Mexican Government is never going to give the U.S. press unrestricted access to the seized weapons because to do so would probably be very embarrassing; the single largest source would probably turn out to be the Mexican gov't itself, through desertions, theft and official corruption. With retail sales in the U.S. a very distant second.
The good general may be an honorable man, I don't know. But I can't stop thinking about the Mexican General in the movie Traffic, who was playing both sides against the middle, and taking money from all the players. What's Spanish for chutzpah?
[Edited to add photo of Tomas Milian playing Gen. Arturo Salazar in Traffic.]