In recent days, Ian McCollum from the Forgotten Weapons channel has published two videos presenting the Polish PM-63 RAK (chambered for 9x18mm Makarov). The first video is a static presentation at a desk, the second one was shot at a shooting range.
An extensive text by Leszek Erenfeicht and Zbigniew Gwoździe, describing this SMG, appeared in the magazine "Strzał" - (05-06). Link to the article on the page of Kwidzyński Klubu Strzelecki VIS: LINK (text available only in Polish).
The photos come from the Piotr Skawiński company's website, a gunsmith's workshop and a weapon shop, in which collector's versions are now available (single fire only). Price: 850 PLN.