Head to the range for all-day training sessions and prideful mag dumps with the ProMag® AR-15 9mm Colt®/SMG-Type 30-Round Drum Magazine from GunMag Warehouse. This ultrareliable aftermarket drum magazine features a durable, steel-lined DuPont™ Zytel® polymer body for lasting performance and durability, while the heat-treated chrome silicon wire spring eliminates binding for smooth, jam-free feeding. Better yet, this magazine is precision-engineered to deliver a snug fit for added reliability. Made in USA.