This rattle was the forearm rattling around on the mag tube. I'm told they all do that. Shame too. It's a great gun if you don't mind the constant chatter.
I just bought my first shotgun last weekend, a used Nova defender. I noticed this as well, I was unsure if it was "normal" or not, it could almost feel loose, but I can't find anything actually wrong with it. I figure my defense shotgun is
supposed to make sounds before firing though, so it's all good
Have you found that the button on the underside of the fore end is stiff, and doesn't engage properly until the action is half way open? My button seems kind of inconsistent and I wonder if it didn't get beat up in a previous life. It's not a big deal though, unloading the mag before clearing the chamber only takes a few seconds, just curious.
It's also worth mentioning to anyone shopping for a Benelli that there are very few accessories available compared to, for example, an 870; Other than a mag extension, what you see on the gun shop shelf is pretty much what you get. There are a number of features I liked on the Nova over the Remmington and Mossberg models in the same price range, saftey/action lock placement, ghost rings, 3.5" chamber, etc.
By the way, I think the Nova looks great, maybe I just have poor taste