I've had this cheapo pellet rifle laying around my house for a while - a Powerline with a break-barrel and 1000 FPS. Every time I fire this gun it is a lot louder than similar guns. I've heard that a possible cause of this may be the hollow stock, and have received recommendations of filling it up with foam. What do you guys think? The noise is not a huge issue - it is actually a pretty decent pellet rifle noise aside - was just curious about it.