Well if you want a PLASTIC gun then get the nova. I mean that literally. The receiver is plastic with a thin metal skeleton molded into it for the bolt to slide on. Actually the receiver and the buttstock are all one big molded plastic piece. Yes I know there are many polymer framed hand guns out there but they are not shooting 3.5 inch shot gun shells either. Benelli makes a good gun but IMHO the nova is not one of them.

Sorry but I prefer to have my barrel, receiver, and bolt lock up metal to metal.

Get the 870.