Initially designed with twin barrels (the ZSU-23-2), a further development led to a 4-barrelled version known as the `Shilka &apos; (ZSU-23-4).
Initially designed with twin barrels (the ZSU-23-2), a further development led to a 4-barrelled version known as the `Shilka &apos; (ZSU-23-4).