I was just cleaning my 64f autoloader after shooting a couple days ago. No problems with shooting and everything seemed ok. I first noticed that when I would push a patch down the barrel it would be tight than about halfway down it would loosen up and than go back to being tight again the rest of the way through. I than gripped the barrel and ran my hand down the outside of it and felt a bump about halfway down. It seems to go all the way around the barrel and not just a certain side. Hopefully this makes sense. I'm just wondering if this is normal or I have a problem... Thanks for any help.