Just got a new PPK by S&W. Question is about the magazine with the finger rest. In the store it was next to a used Interarms. Want to make sure I got the right magazine & that someone looking at both did not mix them up. As the Interarms finger rest has indents on the side of the rest where as the S&W is slab sided, any ideas?? The one I have is different also at the finger rest then the PPK/S (S&W), that one is indented.