Do I need a special barrel to shoot slugs ?

I bought a Maverick by Mossberg Shotgun recently with screw in chokes (full and Improved Cylinder). I would also like to take it deer hunting. A Few people have said that its ok with the improved cylinder choke but very bad with any other choke. I just need to know if i can shoot slugs using the improved Cylinder choke or if i need a separate barrel.