The same type of gun commonly used by Iraqi security forces is legally being sold to civilians in Rock Hill. Surprised? Don't be. It's been happening for years in York County, and more stores are offering AK-47 assault rifles as their popularity grows among collectors since federal restrictions on their sales were lifted in 2004. But law enforcement officials say they've found shell casings at crime scenes recently, and gun-control advocates claim the guns weren't designed for retail sale. Take a drive along Cherry Road, and you'll see David's Pawn Shop advertising the weapons on its marquee, "AK-47s Now In...