If you're looking for a shotgun to hunt and use for home defense you HAVE to look at the Saiga. I personally own 2 of these and there will be more in the future. (theyre all black so the wife cant tell if there are more new ones or its just the same ones shes seen before. Just so long as I don't drag them out of the cabinet all at once!
The Saiga is made by Izmash. It is the factory that produces the REAL AK47. Not the romanian or chinese knockoffs! It is based on the AK platform and is absolutely( IMHO) the best shotty on the market for the money. There is NO changing barrels! It will shoot everything from birdshot to 00Buck and deer slugs! you will love this gun!
You can check them out here
Russian - American Armory Company and they are available locally at Bradis guns in camby. $400 or so.