JSC Konstruktorskoe Buro Priborostroeniya (KBP) is one of the main enterprises in the field of Russian defense industry, based in Tula. It is engaged in designing high-precision weapon systems for the Army, the VMF and the VKS, as well as anti-air defense systems, high-rate-of-fire cannons and small arms, in addition to civilian products. Its full name goes as "Joint-Stock Company Instrument Design Bureau named after Academic A. G. Shipunov". Its shareholders include High Precision Systems, part of the State Corporation Rostec.

The ZU-23-2, also known as ZU-23, is a Soviet towed 23×152mm anti-aircraft twin-barreled autocannon. ZU stands for Zenitnaya Ustanovka – anti-aircraft mount. The GRAU index is 2A13.