It got a thourough cleaning when I bought it. Didn't polish it though.
Maybe someone has a picture of how the cartridge sits in the chamber. I'll post one up when I get home. It seems mine just sits too low and flush with the chamber "mouth".
Not too keen on putting a file to it either. Might try a stronger extractor spring before I do that
It's a shame all of my guns sank with my boat last week...
Time to catch up.....like mayonnaise