A suspect has been arrested in connection with an armed robbery at a Georgia shooting range that left the owners and their teen grandson dead. Jacob Christian Muse is facing three counts of malice murder, according to a news release from the Georgia Bureau of Investigation. The 21-year-old, from College Park, Georgia, was arrested on Friday in the slayings at the Lock Stock & Barrel shooting range in rural Coweta County, about 50 miles southwest of Atlanta. Multiple law enforcement agencies, including the GBI, the Grantville Police Department and the Coweta County Sheriff’s Office, responded t…