The Pr.191 is a Soviet armoured boat developed in 1945 to replace the outdated Pr.1124 armoured boats. The engineers learned from wartime experiences and the predecessor's design to create a new boat with enhanced armour and anti-air defense, as well as slightly higher speed. The first prototype of the Pr.191 was slower than its predecessor, but it featured new armour and an updated design layout. Only one prototype was built, and the mass-production version, the Pr.191M, was equipped with M-50 engines and more powerful heavy machine gun armaments.

Introduced in Update 1.83 "Masters of the Sea", the Pr.191 has a crew of 14 and boasts strong armour that protects against heavy machine guns. Its armament includes an 85 mm cannon, capable of firing HE and APHE shells, making it perfect for targeting armoured enemies. It also features two twin 12.7 mm heavy machine guns, effective against lightly armoured targets and for anti-air defense. Additionally, the boat carries magnetic mines, but these are relatively small and require several mines to effectively sink destroyers by flooding.