Mossberg 500 is good, but I don't like how recoil is terrible with 3" loads and the degree to which the forearm rattles and twists. What is cool to me is that they do sell slug/bird combos.
http://www.basspro.com/Mossberg-500-...hart-container

I don't know what you'll use it for, but if you're going after turkeys, I'd suggest a Remington 870 or a Winchester SXP, instead. Easier to get a 3.5 chamber, if you want it.