SIG SAUER 320 EXT 40RD 9MM MAGSig P320 Magazine 9mm - 40 round - Translucent body - Base plates interchangeable with ETS line of 9mm double stack magazines - Due to the wide variety of extensions for Glock, our mag base is designed to be compatible with Glock extensionssions for Glock, our mag base is designed to be compatible with Glock extensions
