Pro Mag Industries AR-15 Drum Magazine Features The ProMag AR-15 Drum Magazine holds a substantial 120 rounds giving shooters far more capacity than a standard 30-round magazine without needing to carry multiple spare magazines. The magazine body is molded from a proprietary DuPont Zytel-based polymer a durable engineering plastic chosen for its strength and resistance to wear over repeated use. Over-molded stamped steel feed lips and a steel magazine catch reinforce the critical stress points of the magazine areas that see the most wear during feeding and magazine changes. This combination of polymer body and steel reinforcement is designed to extend the magazine s service life well beyond a purely polymer design. Inside an injection molded follower helps guide rounds consistently up through the drum s internal feeding mechanism toward the feed lips. The magazine spring is formed from heat treated chrome silicon wire a material known for maintaining its tension and spring-back properties over thousands of cycles. Built to fit AR-15 rifles chambered in 5.56mm or .223 Rem this drum magazine works across the vast majority of AR-15 platform rifles on the market. Made in the USA the ProMag Drum Magazine gives AR-15 owners a durable high-capacity option for range sessions competition or home defense scenarios where reload frequency matters. Pro Mag Industries AR-15 Drum Magazine Specifications Manufacturer: Pro Mag Industries Model: AR-15 Drum Magazine Compatible Hosts: AR-15/M-16 Caliber: 5.56mm / .223 Rem Capacity: 120 Rounds Material: Zytel Polymer Steel Feed Lips Country of Origin: Made in USA Available At: GrabAGun