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ProMag SMI-A1 SMIAI: This double-stack replacement magazine for your Smith & Wesson 910, 915, 459, or 5900 pistol is constructed from heat-treated blued-steel. Included is an follower, lock-plate, and base-plate molded from a proprietary DuPont Zytel based black polymer. It uses a spring wound from chrome-silicon wire and heat-treated for strength and reliability.