“The Obama administration implemented its most aggressive and controversial gun measure to date Monday when it ordered dealers in four Southwestern states to report multiple sales of semiautomatic rifles to the federal firearms bureau.

The rule, which had been opposed by the National Rifle Association and many members of Congress, takes effect immediately and is meant to stem gunrunning to violent Mexican drug gangs.

It requires about 8,500 dealers operating in the border states of California, Arizona, New Mexico and Texas to alert authorities when a person buys within five days two or more semiautomatic rifles greater than .22-caliber with detachable magazines.”

http://www.washingtonpost.com/politics/gun-dealers-will-have-to-report-multiple-semiautomatic-rifle-sales/2011/07/11/gIQAy3SI9H_story.html