I do not know what these mags are for. My dad had a couple of 9mm P series Rugers, but they were sold with original mags. These are 9mm length, 15 round, double stack, no markings of any kind, but I suspect they are for a Ruger P series. I do not have access to a P series to confirm, and I have nothing that they will fit in. Anyone have any ideas what these are for?