MagPump Magazine Retainer 9mm Double Stack Magazines Smith & Wesson M&P Shield Black MR-SW SHIELD. This solution is the best way to ensure you have a fresh mag for those moments when you want to savor every last second of the hunt. The best way to ensure you're getting the most out of your handgun the MagPump Smith & Wesson M&P Shield 9mm Double Stack Magazine Retainer is a durable dependable and versatile tool that helps you get the most out of your firearm. These Magazine Retentions by MagPump help secure your loaded magazines for reliable feeding every time you need them. You can also install these retainers yourself - no gunsmith required. The MagPump 9mm Luger Magazine Loader works with a wide range of popular double stack magazines so upgrade your current mags to the best of the best with the MagPump Smith & Wesson M&P Shield 9mm Luger Mag Retainer. Specifications for MagPump Smith & Wesson M&P Shield 9mm Double Stack Magazine Retainer: Manufacturer: MagPump Caliber: 9mm Luger Gun Make: Smith & Wesson Gun Model: Smith & Wesson M&P Shield Country of Origin: USA Package Contents: MagPump Smith & Wesson M&P Shield 9mm Double Stack Magazine Retainer MagPump MR-SW SHIELD: Magazine Retainer 9mm Double Stack Magazines Smith & Wesson M&P Shield Black