MagPump Magazine Retainer 9mm Double Stack Magazines Ruger Black MR-RUGER. These Gun Parts from MagPump provide a dependable second set of hands when loading ammunition into your firearm and greatly increase the likelihood of an unintentional discharge. Another benefit of the MagPump Ruger 9mm Double Stack Pistol Magazine Retainer is that it can fit on almost any key chain belt or bag ensuring you always have it on hand when you need it. This add-on is especially useful for airsoft guns and is meant to boost the ammunition capacity of any sub-compact or sub-compact pistol loaded with a second set of magazines. Get your MagPump Ruger 9mm Double Stack Retainer and see just how much quicker and easier it has made your loading sessions. Specifications for MagPump Ruger 9mm Double Stack Magazine Retainer: Manufacturer: MagPump Caliber: 9mm Luger Gun Make: Ruger Gun Model: Ruger SR9 Compact Ruger SR9 Country of Origin: USA Package Contents: MagPump Ruger 9mm Double Stack Magazine Retainer MagPump MR-RUGER : Magazine Retainer 9mm Double Stack Magazines Ruger Black