Handguns, rifles and bullets that stoke one of the world's highest murder rates.The volume is much less than the flow of U.S. guns into Mexico that end up in the hands of drug cartels -- Jamaican authorities recover fewer than 1,000 firearms a year. But of those whose origin can be traced, 80 percent come from the U.S., Jamaican law enforcement officials have said in interviews with The Associated Press.And as the Obama administration cracks down on smuggling into Mexico, Jamaicans fear even more firearms will reach the gangs whose turf wars plague the island of 2.8 million people.''It's going to push a lot of that trade back toward the Caribbean like it was back in the '80s,'' said Vance Callender, an attache at the U.S. Embassy in Kingston for Immigration and Customs Enforcement (ICE).U.S....