Finnish 55 S 55 light recoilless rifle with training ammunition (armour piercing shot left, high explosive fragmentation right, blank in the middle). Photographed in RUK-museum in Hamina.
<a href="//commons.wikimedia.org/wiki/User:MKFI" title="User:MKFI">MKFI</a>
<span class="int-own-work" lang="en">Own work</span>