I cut my 97 back to 19" and installed a modified choke tube. There is not a lot of meat left to screw the bead into, so after losing my bead a couple of times, I had a smith drill and tap rite through the choke. I like the modified choke because if you get a stubborn knockdown more pattern on the steel is a good thing. Also a lot of the clubs here in BC will have a knockdown activate a clay pidgeon, a modified choke gives a little better chance of hitting a flyer. After you have cut the gun down to fit, you mite want to look at a mercury recoil reducer. One of our shooters put 2 in his wifes gun. One in the butt and one in the magazine tube. We go to all this trouble to convince our laddies to come shoot with us, we should make sure they don't get all beat up.
Looking forward to shooting with you.