A few years back, on another blue-like forum far far away, someone recommended ATF to clean up guns by soaking them. A few weeks back I did some clay target shooting and one of my shotguns, a S&W pump kept having feed issues. I bought it used several years ago and I've shot it a few times, always doing a normal cleaning afterwards, but I never tried to rapidly feed shells through the action. I took off the stock, cut the top off a plastic jug and soaked the action in ATF for a couple of weeks in the garage (I actually forgot about it!). Anyway, cleaned her up and it feeds like a charm! I'd recommend it for projects where you have time on your hands.