Hunter Holman : I am assuming that this is what you meant to refer to . Link Below :
http://www.sears.com/united-states-stove-company-double-barrel-adapter-kit/p-SPM7926654802?hlSellerId=14226&sid=IDx20110310x00001i&kpid=SPM7926654802&kispla=SPM7926654802
please note two things 1) The only purpose for the upper barrel is to serve as a radiator . 2) The addition of a plunger tube or length of additional stove pipe
attached to and descending from that 2nd barrels discharge port will draw its waste exhaust gases from near that barrels lowest point increasing the stoves efficiency!
The problem, even if the lower barrel is lined with firebrick -is to maintain a steady state waste gas temperature above 500ºƒ to assure combustion of ALL the Creosote
Anyone who has access to the right type of 55 gallon Barrel can make one of these advanced units, and with insulated stove pipe these barrel
heaters can be used
safely! For the crafts Big AL