I've done a little research on this myself.
different contours and barrel lengths make conversion a long, expensive, and difficult process.
I have also done quite a bit of searching and have been unable to find any mannlicher style stocks for the M77 or NO1
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the stuff people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin