ℹ️ ➖➖➖ The ZPU (Russian: ЗПУ; зенитная пулемётная установка, romanized: zenitnaya pulemotnaya ustanovka, meaning "anti-aircraft machine gun mount") is a family of towed anti-aircraft gun based on the Soviet 14.5×114mm KPV heavy machine gun. It entered service with the Soviet Union in 1949 and is used by over 50 countries worldwide.
All weapons in the ZPU series have air-cooled quick-change barrels and can fire a variety of ammunition including API (B32), API (BS41), API-T (BZT) and I-T (ZP) projectiles. Each barrel has a maximum rate of fire of around 600 rounds per minute, though this is practically limited to about 150 rounds per minute.
The quad-barrel ZPU-4 uses a four-wheel carriage similar to that once used by the obsolete 25 mm automatic anti-aircraft gun M1940. In the firing position, the weapon is lowered onto firing jacks. It can be brought in and out of action in about 15 to 20 seconds and can be fired with the wheels in the travelling position if needed.
📑 ➖➖➖ 50 of those units was gifted by North Korea in 1986. In North Korea, ZPU systems have been modified to be able to be directed by an MR-104 'Drum Tilt', where the guns are shown to be fired without personnel manning them. ZPU anti-aircraft machine guns, gifted by North Korea in 1986 together with 900,000 rounds of ammunition, cannot be fired at their full rate of fire for safety reasons “because we have no idea how many rounds have been fired through the barrels.”

▪️🛠Manufacturer ZPU
▪️⏫ Shell 14.5x114
▪️⏫ Calibre 14.5 mm
▪️➡️ Barrels 1-4
▪️🔁 Action Gas operated
▪️🔝 Effective firing range 1.4 km
▪️⏏️ Maximum firing range 8 km

Ref: Wikipedia; maltatoday.