I have an encore with synthetic stocks. I have checked and double checked everything on this gun and I cant find anything even remotely loose but yet if I hold the gun loosely and close it smartly I hear a buzzing/rattling sound that seems to be coming from the hollow synthetic buttstock. I have checked the allen head bolt that holds the stock to the receiver and recoil pad twice and find no sign of looseness. Is this just the sound of the action being closed and echoing in the hollow buttstock?