The Caldwell Mag Charger Rimfire AR-15 Magazine Loader is the fastest AR-15 22LR magazine loader on the market. The Magazine Loader is compatible with all popular AR-15 22LR magazines with load assist mag button. Constructed from durable polycarbonate the Mag Loader can handle daily use! The Mag Loader features an ammo hopper that automatically orients round for loading and also holds up to 100 rounds of your favorite 22LR ammo.