Odin Works Pistol Magazine Base, +5 Rounds, Anodized Finish, Fits Glock 17, Black ACC-PMB-GLOCK-17-BLK Guaranteed to give you an edge" Odin has designed the PMB (Pistol Magazine Base) with the competitive and noncompetitive shooter in mind. Introducing the GLOCK PMB: Ergonomically machined to fit perfectly in the palm of your hand for effortless stripping" the weighted base allows for rapid mag changes and 5 extra rounds all while remaining well within the 140 mm gauge limits of USPSA. This mag base is compatible with the Glock 17 (full size 9mm).