Earlier this year I got a replacement stock from Ruger for a All Weather M77 MKII. I asked if a Hawkeye stocks are the same as a MKII. I was told by the Ruger CS Rep that are different and not interchangeable. I have not tried to put a MKII stock on a Hawkeye to see if they will work or not..going by what I was told you'll have to get a Hawkeye stock and not a MKII.