The magazine is 9" long and is labelled "S&W 9mm." I think it hold 30 rounds, but I could be mistaken. I acquired it in a pile of stuff from a deceased person. I'd like to re-direct it to someone who can use it.
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Looks like a 59 series mag. More often than not, these were used in the Marlin camp 9 carbines I think.
I believe that will fit the Kel Tec P11.
It should even work in a kel-tek 9mm.