Hi faceplant, Sounds like a great plan to me. I got my tactical skeet gun. A 11-87 Sportsman w/ Choate PG stock and a 26" bbl. I stayed with the longer barrel, so I could put on a 5 rd extention. In Michigan a semi auto can't have more than 5 rd capacity, for hunting. So if I was going hunting, I'd just take off the extention. Go for it!
The only thing you miss out on, is the sound of a pump gun. But with an auto, letting the bolt slam home is just as scarey a sound.