Hey guys, I also have a Nova. Mine rattled to. It was the forestock. All I did was tighten the 2 set screws on either side of the forestock and that took care of the problem. If you get them to tight it relly make the action hard so be careful and dont over tighten. I have shot several boxes of shells through this gun and it is as quiet and smooth as any other pump I've seen. Good luck to all.