As was mentioned the Jukar barrels were usually good and shot accurately.
The Jukar locks were usually poorly made, often not even having a bridle over the tumbler.
This left the inner end of it unsupported and because of this, the hole thru the lockplate would wear out.
The frizzens often were not fully hardened and would not produce a good shower of sparks.
If your lock has a bridle (bridge over the tumbler supporting the inner end) and it makes a good shower of sparks you could get a replacement stock from Pecatonica River for about
I would recommend a Leman (not Lyman) Halfstock with a 15/16" barrel channel.
http://www.longrifles-pr.com/stockprices.shtml
If it were made using the lowest cost wood they offer the bill would be $70 for the wood and about $50 for the stock carving/barrel channel cutting.
http://www.longrifles-pr.com/stockprices.shtml
You would have to call them and talk to Dick Greensides to tell him you don't want the lock mortice cut.
You would also have to be willing to put probably 120 hours of work into that stock to end up with a finished gun.
You have the advantage of having the old stock so you can measure the dimensions and use the old trigger guard etc.
These stocks are far from a "drop in".
You will have to cut the lock mortice, trigger mortice, butt plate interface, drill lock screw holes and barrel tang holes.
It's a lot of work and when your done the finished gun will be worth a fortune to you but most other people won't pay much over $150 for it.
If that's what you want, go for it and don't forget to use our Gun Builders Bench to help you thru the questions and problems.