MagPump Magazine Retainer 9mm Double Stack Magazines Browning Hi Power Black MR-BROWNING HI POWER. These Gun Parts from MagPump feature a double sided tapered retainer surface that securely holds your ammunition without damage. This MagPump Browning Hi-Power 9mm Luger Magazine Retainer Refit for Browning Hi-Power Ammunition Magazines also work with most standard reloading magazines so that you can get more rounds on target with each pump. Whether you're a competitive shooter or a gun lover you'll love the benefits that come from using a MagPump Browning Hi-Power 9mm Double Stack Ammo Retainer. Specifications for MagPump Browning Hi Power 9mm Double Stack Magazine Retainer: Manufacturer: MagPump Caliber: 9mm Luger Gun Make: Browning Gun Model: Browning Hi-Power Country of Origin: USA Package Contents: MagPump Browning Hi Power 9mm Double Stack Magazine Retainer MagPump MR-BROWNING HI POWER: Magazine Retainer 9mm Double Stack Magazines Browning Hi Power Black