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The ProMag SMIA23 is a 20-round aftermarket pistol magazine designed to fit Smith & Wesson M&P 9mm series pistols. Built with a heat-treated steel magazine body and a blued/black oxide style finish, it’s engineered for durability and consistent performance on the range. Internal components include an injection-molded follower and a spring formed from heat-treated chrome silicone wire for reliable feeding.
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