Discovery Channel has given a fourth season to its reality show Sons of Guns. The show -- which centers on Red Jacket Firearms, a custom gun-making company in Louisiana -- is set to return at 9 p.m. ET/PT on Friday, April 19. Will Hayden, his daughter Stephanie, Joe, Kris, Charlie, Flem and the rest of Red Jacket staff are returning for season four, which will see the crew handling major firepower, including a rare handheld WWII PIAT, a Russian cannon and a M36 tank. Meanwhile, Vince, a former employee, resurfaces, and his reappearance as a possible competitor could spell trouble...