Just an FYI for those who aren't overly familiar with firearms. The wral.com article says that an AR-15 rifle was found at the guy's house. The AR-15 is the civilian version of the military M-16. It does use a .223 caliber round which is what has been used in all of the killings. While the standard military M-16 is not a sniper weapon, with a few common modifications (longer barrel, telescopic sight) an AR-15 can certainly be made accurate enough for sniper use.

Bruce