Hundreds of people showed up Saturday morning for a gun buyback in Seattle. One man even brought a rocket launcher. He said it had already been used and could not do any harm. Mason Vranish said he bought it from a man for $100, but within seconds police took it off his hands. “Their reason was even though it was single time use item it is still military property concern that a soldier had stolen it from the base or whatever and it wasn't theirs to own... so it somehow ended up in the civilian market illegally,” said Vranish. Officers...