Most of the shotguns sold nowadays have a threaded barrel that allows you to screw in whatever choke you want depending on the game you're hunting and it will probably come with several. You will probably want improved, modified, and full chokes at a minimum and if you go turkey hunting with it you will probably want an even tighter choke than a full to get a very tight pattern since you want as many pellets in the head and neck as you can get. As mentioned on your other thread, it would probably be best to find a mentor that knows all the ins and outs from years of experience and he can help you get into purchasing the gear you'll need.