Hey gents .. have a nice little Winchester 1906 I just picked up. About 5 centimeters from the muzzle, there is a small ring of metal in the barrel. I can get a jag and patch past it, but not a brush. I did all the research on what to use (if lead). I tried solvent, tried peroxide and vinegar. The stuff came out clear! The bore looks not too bad if I can just get this ring or partial ring out of the barrel! Any ideas? If it isn't lead .. what the hell is it?
Hopefully one of you have some idea what is going on
thanks!

Hopefully one of you have some idea what is going on
thanks!