The Promag® Smith & Wesson® SD9® 9mm 50-Round Drum Magazine is the perfect companion for high-volume shooters, rapid-fire drills, and ringing steel targets with dependable firepower. This ultrareliable drum magazine features a durable, corrosion-resistant DuPont® Zytel™ polymer body with a reinforced steel magazine tower, engineered to deliver a precise fit for added reliability. Plus, backed by ProMag’s legendary lifetime warranty, this magazine features a heat-treated chrome silicon wire spring and injection-molded polymer follower for smooth, reliable feeding performance. Made in USA.