This is a factory .40 S&W 10-round magazine for MR Eagle pistols.
Evolving on the success of the Baby Eagle—and inspired by the iconic design of the Desert Eagle—Magnum Research MR Eagle offers serious, practical firepower, impressive ergonomics, and a host of other cutting-edge features for modern shooters …
These 15-round magazines are designed for use with Magnum Research’s “Fast Action” Striker-Fired MR Eagle pistols, and WILL NOT work with older Israeli-made models. Built from durable steel with polymer baseplates and clear-cut witness holes, these factory magazines are designed to endure even the toughest climates without failure or malfunction.
These magazines are also compatible with some models of S&W 99/Walther P99/PPQ pistols.