A Concord man is facing charges after he allegedly fired a gun in the city's downtown area last spring.Investigators said in April, there was an incident near Park Street. They said it involved members of the Knights of Sin, Outlaws and Hells Angels Motorcycle Clubs.That's when police said Jeremy Ducharme, 39, fired a shot from a handgun. No one was hurt. Ducharme is scheduled to be arraigned Sept. 1 at Merrimack County Superior Court.