Hi Ed
This was my DIY project and than I came up with this idea.
If you have at least mitre saw and drill press and a lots of experience it is not difficult to cut and drill the stock ,If you use the original stock.
If you buy used stock
it is not just about cutting and drilling the stock- the rifle has to be fitted in to the stock.Mag has to fit properly and trigger assembly has to fit in just right.It is safety issue, it is not "legall"issue.That is a job for an experienced person.
jv1