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.
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Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.