In "The Man Who Was Almost a Man," how does Dave finally get a gun?

Dave finally gets a gun when he brings his courage to go to the local store to check out the guns. The shop owner, Joe hands him a catalog which he takes home. Joe had offered him an old gun that was $2. He later on asked his mom if he could have some money to buy it and she eventually gave him the money but told him to show her the gun when he bought it.