MD beat me to it

http://www.flitz.com/p-16-flitz-polish-paste.aspx

If you want I can send you the wrench to remove that BP (just send it back when you are done) but I suggest you replace it with a hex head plug.

http://www.knightrifles.com/breech-plug-M900023/

I replaced the original plug on my BK-92 just use a 7/16th socket to remove it.