I've been soaking the gun in wd40 for a couple weeks.....got the nipple out not too bad, the breach plug was harder had to take the stock off and put the barrel in a vice but I get it 2nd try

but couldn't see thru the barrel.....breach plug was full of powder....had to bang a maxi hunter out bore looks like new no pits I can see... bright too ....got a patch soaked in hoppes #9 sitting where the powder was allmost all out now, looks like I lucked out