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An extended, double-stack 20-rd magazine for the Smith & Wesson 910, 915, 459, and 5900 series of pistols in 9mm. Constructed from heat-treated blued-steel, with a follower, lock-plate, and base-plate molded from a proprietary DuPont Zytel based black polymer; and using a spring wound from Chrome-silicon wire and heat-treated for strength and reliability.