Only difference between the Mark I's and Mark II's is that the Mark I's are single-shot and the Mark II's are repeaters. So technically a Mark II stock will bolt right onto your Mark I rifle, BUT...you'll have a big hole in the bottom of it where the magazine would typically be sticking out.
I'm sure Fred at SSS could make you one of his rimfire stocks without the mag well cut out which would resolve that one little issue.
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