Yes I know of the Savage mags to be filed down & notched. I searched you tube for very limited information. None of which actually showing it done. I have a friend who ruined 3 out of 6 that he tried. Quite a lot of work that goes into it. I might try/ sacrifice one just to see for the .22 LR. Now I own the .22 MAG. An aftermarket just came today for $85 and only hold 8 rounds. There really has to be (or should be) better options out there!