MagPump Magazine Retainer 9mm Double Stack Magazines Smith & Wesson Black MR-SMITH & WESSON. These Speed Loaders made by MagPump use a spring-loaded punch to easily and quickly drop magazines out with a patented mechanism and these mag catchers can be utilized to assist loading or empty magazines. With a little practice you can have an almost effortless process of continuously filling up your mags with fresh rounds greatly expanding the number of weapons you can use with your family. Pick up the MagPump Smith/Wesson Double Stack Retainers for mags with double stack magazines and your pistol magazines will always be close at hand for more ammo. Specifications for MagPump Smith & Wesson 9mm Double Stack Magazine Retainer: Manufacturer: MagPump Caliber: 9mm Luger Gun Make: Smith & Wesson Country of Origin: USA Package Contents: MagPump Smith & Wesson 9mm Double Stack Magazine Retainer MagPump MR-SMITH & WESSON: Magazine Retainer 9mm Double Stack Magazines Smith & Wesson Black