The Close Range Naval-91 is a naval version of the Medak 30mm automatic gun installed on the Sarath Infantry fighting vehicle, a variant of the Russian BMP-2 manufactured in India under license by the Ordnance Factory Medak. The Medak gun itself is based on the Russian Shipunov 2A42 30 mm automatic cannon.

The Shipunov 2A42 is a Soviet/Russian 30 mm autocannon. It is built by the Tulamashzavod Joint Stock Company and named after A. G. Shipunov.