A man who sent a text message threatening to kill a woman and then showed up at her door with a gun will serve 20 days in jail.The man, David Shannon Bain, 38, was ordered by General Sessions Judge Bill Locke to serve 20 days of an 11-month, 29-day sentence and perform 25 hours public service work on the reduced charge of simple assault. He was originally charged with felony assault.His sentence comes after he texted the female victim and told her he was coming over with a gun. The texts reportedly began over trouble Bain was having with the victim’s father.The woman said she looked out her window and saw a gun in Bain’s hand when he arrived minutes later “hitting and screaming at the door.”