Pro Mag Industries Drum Magazine for AR-15 Features The ProMag Drum Magazine for AR-15 holds 100 rounds of 5.56mm or .223 Rem giving shooters significantly extended capacity over a standard 30 round magazine. Overmolded stamped steel feed lips and a reinforced magazine catch are built into the drum to ensure reliable feeding and secure retention in the rifle s magwell. The magazine body itself is constructed from a proprietary DuPont Zytel based polymer a tough engineering plastic that keeps the drum durable while managing overall weight. An injection molded follower pushes rounds consistently toward the feed lips as the drum empties. The magazine spring is formed from heat treated chrome silicon wire a material chosen for its ability to retain tension through repeated loading and unloading cycles. This attention to spring quality helps the drum maintain reliable feeding even after extended use. Made in the USA the ProMag Drum Magazine reflects a commitment to domestic manufacturing and quality control. The ProMag Drum Magazine for AR-15 is available for sale at GrabAGun for shooters who want extended capacity for range sessions or home defense. Pro Mag Industries Drum Magazine for AR-15 Specifications Manufacturer: Pro Mag Industries Model: Drum Magazine for AR-15 Caliber: 5.56 / .223 Rem Capacity: 100 Rounds Compatible Hosts: AR-15/M-16 Material: DuPont Zytel Based Polymer Country of Manufacture: USA Available At: GrabAGun