This may be a dumb question, but the Mossberg 500 12ga that I use for duck hunting came with a "security barrel". From what I gather, besides being shorter, this is a smooth barrel with no choke to it... would this work with rifled slugs? I looked on the Mossberg website, and they offer a slug barrel with rear sights, but I'm still looking for a use for the 2nd barrel that came with my gun. Is it safe to play with it with rifled slugs to see if I can hit anything?