ProMag Ruger SR40 .40 SW 50 Round Drum Black Polymer Mag

The ProMag Ruger SR40 .40 SW 50 Round Drum Black Polymer Mag is a 50 round drum magazine that fits the Ruger SR40 .40 Smith and Wesson. It features an injection molded magazine follower and the magazine spring is formed from heat treated chrome silicon wire. ProMag's magazines are proudly made in the USA.