If you don't want to spend any money, go with IC choke. For around $30, you can get a carlson rifled choke tube which is a little more accurate. Remington sluggers out of a smooth bore are probably good out to 40 to 50 yds. Try Brenneke and Fiochi slugs for a little more range and accuracy. You might also consider getting a cheap saddle mount scope or at least some snap on or magnetic rifle sights for it which run around $20.