2S7 Pion was developed and built for heavy altilery units. This vechicles had 203mm guns and their effective fire range(with highest accuracy) was 37 500 metres and real range of these guns was between 30 and 40 kilometres. Currently all or most of thesevechicles was removed from duty and turned into museal exhibitions. The photo shows one of 2S7 Pion in Poznań in Land Units Trainign Center