so there is a good deal on Remington 870 "police" shotguns, used. price is a little lower than an 870 express brand new at my local store. my understanding is the police models have more "clout" than the normal expresses. better built, more metal intervals, thicker barrel? so assuming the police model is in reasonable condition, what would you recommend? used police for cheaper and nicer or new express but it's new.