I have a basically brand new Browning Cynergy (2000 rds through it) that has some light rust forming right at the break. You can't see it unless it is broke open. I want to get it now before it gets any worse. I have no idea how it happened. I have never shot it in the rain. I am currently waiting on a hard "break down" case so for the moment, the only case I have is a soft case that holds the gun assembled. Any input is greatly appreciated. Thanks.