The standard BX-1 rotary magazine stores the cartridges in a cogwheel-like holder, rather than stacked as seen in a box magazine. This allows the magazine to be very compact and fit flush into the rifle without protruding from the stock at the natural balance point for one-handed carry. The bolt of the rifle pushes a cartridge from the metal feeding lip of the magazine with each shot, allowing the next cartridge to feed into place. Due to its time-tested reliability, the rotary magazine is also used by the Ruger's American Rimfire series bolt-action rifles, as well as the 10/22-footprinted "Summit" toggle-action rifles produced by Primary Weapon Systems/Vorquartsen. Even Ruger's market competitor Savage Arms has recently adopted a detachable rotary magazine design similar to the BX-1 in its new A series (semi-automatic) and B series (bolt-action) rimfire rifles.