Earlier this year, having claimed that Georgia’s Adventure Outdoors Inc. sold 21 guns later used in crimes in New York City, mayor Michael Bloomberg called the business a “rogue gun dealer.” Now, according to this Atlanta Business Chronicle story, the dealer is shooting back. With support from former U.S. Rep. Bob Barr, the gun shop is suing Bloomberg for $400 million, claiming the media mogul organized an illegal and “nefarious” undercover sting on the small business.