MagPump Magazine Retainer 9mm Double Stack Magazines SIG Black MR-SIG. These Speed Loaders by MagPump are specifically designed to work with double-stack magazines so that you can quickly and efficiently insert ammunition with the MagPump SIG Sauer 9mm DMR Insert Loader - LUGER. These Speed Loaders are some of the most flexible and adaptable on the market letting you fit them to pretty much any pistol mag on the market. The MagPump SIG 9mm Luger Retainer is an excellent device that saves you tons of time and anguish in the field or at the range. Simplify your reloads and gain a significant advantage over your opponents when you use the MagPump SIG 9mm DURR Magazine Retainer. Specifications for MagPump SIG Sauer 9mm Double Stack Magazine Retainer: Manufacturer: MagPump Caliber: 9mm Luger Gun Make: SIG Sauer Gun Model: SIG Sauer Pro Country of Origin: USA Package Contents: MagPump SIG Sauer 9mm Double Stack Magazine Retainer MagPump MR-SIG : Magazine Retainer 9mm Double Stack Magazines SIG Black