Designed to fit your AR-15 pattern rifles chambered in .223 Remington and 5.56x45mm. This drum magazine feeds alternately from the left and right drums with the assistance of two follower belts, resulting in a fixed center of gravity while firing. The reinforced feed lips and tension arms are made of solid steel. While a loaded aluminum 30 round magazine weighs about 1.5 lbs, the rugged KCI USA drum weighs only 2.2 lbs (1 kg) unloaded and 5 lbs (2.27 kg) loaded. A simple loader is included with each magazine making loading fast and easy. This package includes the KCI USA 100 Round Drum, Operator’s Manual, Carrying Pouch, Graphite Lubricant, and Loader.