Why the Pantsir pairs guns with missiles, and where it drops the guns

The specific feature of the Pantsir-S1 system is the combination of a multiple-band target acquisition and tracking system in conjunction with a combined missile and gun armament creating a continuous target engagement zone from 5 m (16 ft) height and 200 m (660 ft) range up to 15 km (9.3 mi) height and 20 km (12 mi) range, even without any external support.