SMI 31 - ProMag - Smith & Wesson Shield .40 S&W - 9 Round - Blue Steel

SMI 31 - ProMag - Smith & Wesson Shield .40 S&W - 9 Round - Blue Steel

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SMI 31 - Introducing the new PROMAG® SMI 31, a 9-round magazine for the Smith & Wesson® Shield® in .40 caliber. Constructed from heat-treated blued-steel, components molded from our proprietary TECHNAPOLYMER® and our anti-fatigue spring.

SMI 31 - Introducing the new PROMAG® SMI 31, a 9-round magazine for the Smith & Wesson® Shield® in .40 caliber. Constructed from heat-treated blued-steel, components molded from our proprietary TECHNAPOLYMER® and our anti-fatigue spring, so you can keep the magazine loaded and ready for up to six years without concern.