The ZPU-4 is a Soviet-designed anti-aircraft gun system that features four 14.5 mm KPV heavy machine guns mounted on a wheeled chassis. It was developed in the 1950s and is primarily used for defending against low-flying aircraft. The ZPU-4 is known for its high rate of fire and effectiveness in providing close air defense. This weapon system is often deployed in military settings and can be towed by vehicles for mobility. The ZPU-4 has been utilized by various countries and has seen action in numerous conflicts, showcasing its reliability and versatility in ground-based air defense roles.