i suggest you put a thin coat of lacquer on the stock also some on the inside of the stock, for the grips i use mineral oil. this is just a precaution measure, makes it look nicer as well.I've seen the (new) wood 870 swell with small amount of moister also seen a swollen up pa-08 that was fished out of the river the stock was messed up, thats the reason to coat the inside of the stock. if its a benelli it might have a fibreglass resin on the inside of the stock the ultra light has this.
my 2 cents
if you can read this your almost as smart as a dolphin.