The 2B16 Nona-K towed weapon is simply a very uncommon design, presently most likely only in the [Russian army](https://defence24.pl/wojna-na-ukrainie-raport-specjalny-defence24/wycofane-armatomozdzierze-zauwazone-na-krymie) and Ukrainian army. In addition, it was created in most likely a tiny number (by the standards of the USSR's arms industry), so its capture at the front in the 5th year of the Russian invasion is worth noting.