I know this is an ancient thread, but its an ancient gun, so...
Here is a picture and discussion of one built from scratch (except $5 bbl). http://www.go2gbo.com/forums/index.p...199913.30.html
One may need to get logged in to view it; don't know, but if all you need is a couple parts, they are as close as a piece of scrap, hacksaw and file.
The whole gun only cost 10 bucks cash outlay; first shot in the field paid for it w/a fox worth $15. (Jerry's book was well worth the $5 download price.)