Standard issue magazines are 20- or 30-round staggered-column
magazines and traditional box magazines exist in 40- and 45-round capacities.
Drum magazines with 90- and 100-round capacities, such as
Beta C-Mags are available, as well. Low-capacity magazines, usually of a 5- or 10-round capacity, are available to comply with some areas' legal restrictions, for
hunting, and for benchrest shooting, where a larger magazine can be inconvenient.
Surefire is now offering extended capacity magazines in 60- and 100-round capacity configurations. These are of a staggered column design, dubbed
casket magazines due to their shape.