While cleaning my S&W 638 I accidentally dropped it onto the table over which I was cleaning it. It only fell about 6 inches, but landed on the butt end of the gun (where the backstrap is visible between the grips). No mark on the gun, but could it have jarred anything loose inside? It feels and sounds the same and I thought initially that it was fine as the metal is solid back there and it would take a lot more to damage it, but after thinking about it I figured I'd ask the experts just to be sure. Thanks.