Self-loading shotguns are reloaded by the energy of powder gases exhausted from the barrel bore. Excellent balance and stability of the shotgun while shooting are provided with the peculiar assembly of the gas unit and magazine device. The shotgun TOZ-88-01 differs from the shotgun TOZ-88, as it is equipped with fixed muzzle chokes while the model TOZ-88-03 is completed with external choke tubes. The shotguns have got a device for the exhaust of gas away from the gas chamber that allows using the loads of various power degrees with a non-metal case, which length is up to 76 mm, while shooting.
