Maximize your firepower with the KCI USA KCI-MZ036 100 Round Drum Magazine, designed specifically for AR-15, M16, and M4 platforms. This magazine enhances your shooting experience with advanced reliability and durability. Engineered for 5.56x45mm and .223 Remington cartridges, this drum features dual independent follower belts and steel reinforced feed lips to ensure smooth operation and maintain balance during use. The package includes essential accessories for optimal performance. Compatibility: AR-15 / M16 / M4 Caliber: 5.56x45mm / .223 Remington Capacity: 100 Rounds Body Material: Durable Polymer & Steel Spring Material: Music Wire Elevate your shooting game confidently with a lifetime warranty included.