MagPump Magazine Retainer 9mm Single Stack Magazines GLOCK 43X/ 48 Black MR-GLOCK43X 48. MagPump constructed these Speed Loaders from heavy-duty steel with a black anodized finish for maximum strength that won't damage your firearm and these MagPump 9mm SS Retainers are rated for single- or multi-stack magazines so that you can easily load your mags with the MagPump 9mm Luger Magazine Loader. Also these retainers will fit most Glock models so you can quickly determine which model of Glock is the best fit for your pistol. Ensure you always have a valid magazine for use with your MagPump 9mm Single Stack Pistol Magazine Retainers by your side to always have a reliable reloading tool on hand. Specifications for MagPump 9mm Single Stack Magazine Retainer: Manufacturer: MagPump Color: Black Caliber: 9mm Luger Gun Make: Glock Country of Origin: USA Package Contents: MagPump 9mm Single Stack Magazine Retainer MagPump MR-GLOCK43X 48: Magazine Retainer 9mm Single Stack Magazines GLOCK 43X/ 48 Black