A rapper was gunned down early Monday outside his home in a possible robbery, police said. Stack Bundles was shot in the head and neck at about 5 a.m. on a Queens street after a night out with friends, said police, who were investigating whether the unidentified shooter stole a chain from the victim. The 24-year-old rapper, whose real name was Rayquon Elliot, had worked with established artists including Fabolous and DJ Clue and was affiliated with Byrd Gang Records. The label "is deeply saddened by our loss," manager Yancy Smith said in a statement. "A young star's light was put out before he had a chance to shine in front of the world."