Geo., barrel neglect is always the culprit.

Buy a bore snake, saturate it with the lube of your choosing, and keep it with your Lindner. Every time you shoot that gun, it will be in the case, ready to go.

That's the only remedy I've found that was easy, and cheap.

I buy bore snakes or their clones on Amazon, and just put them in the case and leave them.

I hunt salt water on occasion, and it's murder on old doubles.

Out there doing it best I can.