Looks like a Winchester model 64 semiauto. Few of them around still - and may take a mag that also fits other models.
It may also be a Cooey (from Canada). The model 64 was designed by Cooey, but Olin Winchester bought Cooey in I think the 60s and brought this model out under their name. Not entirely sure what happened next but Lakefield (another Canadian co) may have then bought the Cooey name/product line, and Lakefield of course was subsequently bought by Savage. Which is why this also looks alot like a Savage 64 semi. Like a bloody soap opera....
Serial should tell alot... as should any other markings. Where is old Muzza when you need him - he was very good with American rimfires?
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