The Pleter M91 is a simple design, but a high-quality one that was manufactured by a proper factory production line. The company making it was planning on (hoping for?) large-scale production, and they invested to proper polymer molds and other tools to make the gun. A total of about 4500 were made, making it the most-produced of the many Croatian domestic submachine guns.

Mechanically, the gun is most closely related to the Sten - which is clear when one sees the bolt. The magazine chosen was the Uzi magazine, and these were all chambered for 9mm. A small number were made with vented barrels and suppressors, but I don't have one of those to show you.

A big thanks to the Croatian Police Museum (Muzej Policije) in Zagreb for giving me access to film this rare piece for you! Check them out at: https://muzej-policije.gov.hr