Choke stuck, Rust. I tried soaking in liquid wrench 4 inches in a cup barrel down let soak for 6 hrs then 24 hours. had 3, 6 foot tall or better guys put there hands and strenght with choke wrench. shot 2 50 rounds put heat into barrel. I have firend who i shoot with at the club.who is a machinst/ metal waiting for results.