Shield Arms Z9, 9MM, 9 Rounds, Fits Glock 43, PowerCron Finish, Black Z9-PM-9-PC The Z9 magazine is a 9 round magazine for the Glock 43. The Z9 is a steel magazine" and is the same length as the OEM Glock magazine with pinky extension" but holds an additional 3 rounds. Powercron is a cationic epoxy coating that offers excellent corrosion resistance and low VOC in a lead-free film electrocoat surface finish. If you are in a humid or salt water environment" or if you sweat a lot" we recommend Powercron" Electroless Nickel" or Black Electroless Nickel finish.