I have a PDF manual, send me your email address via PM and I will send it to you.
The MK is one heck of a good plunger rifle. Can be accurate as all get out.
Not all MK's had a GM barrel, really depends on the age of the rifle. But! no matter the contract barrels that we used when the rifle was introduced are actually really good barrels,
THE KNIGHT MK-85 MAKES THE FIELD & STREAM'S 50 BEST GUNS EVER MADE LIST
“Tony Knight is another country gunsmith who changed the way things are done. In 1985, he built muzzleloaders with the nipple at the rear of the barrel, directly behind the powder charge instead of alongside. This made ignition far more reliable and began the Great Blackpowder Revolution, which has resulted in muzzleloaders that are practically as accurate, reliable, and fast to load as cartridge-firing arms. All this drives traditionalists mad. But ordinary hunters love it.” – Field & Stream