Cowboys take up AK47s to combat drug runners on Mexican frontier By Philip Sherwell, near Nogales, Arizona (Filed: 20/11/2005) As he careered along the rock-strewn gulley towards his silver mine deep in the Sonoran desert of southern Arizona, Roger McCaslin first checked his bowie knife, then his pistol, and finally his Kalashnikov. From the road, he had already noticed that something was wrong. Under the harsh sun, Mr McCaslin's black cowboy hat cast a shadow over his droopy moustache and a face so deeply creased that it resembled cracked saddle leather. Welcome to the Wild West 2005, where modern-day cowboys...