Czechoslovak and Czech submachine gun, developed for the 7.62 × 39 mm cartridge in Czechoslovakia in 1958 at the state Armory Česka Zbrojovka in ugerski Brod and entered service in the late 1950s. Replaced the VZ self-loading rifle. 52 and Sa 24 and Sa 26 submachine guns. Externally resembling a Kalashnikov assault rifle, the Sa vz. 58 uses a different principle of automatic operation, and AK magazines are incompatible with this machine. Since 2010, it has been gradually replaced by new CZ 805 automatic weapons.