Agree with Westicle. You should be able to get the thinner walled chokes put in. Had a barrel hacked about 10 years ago, from 30 inch full choke to a 26 inch barrel with screw in chokes. Offhand I cannot remember the name of the choke put in, but I could look just as easy. Again you SHOULD be able to, but check with a few smith's first just to make sure.