The Project 186 armored boats, developed by the Leningrad Design Bureau of the Admiralty Shipyard in 1944, were an improvement on the well-proven Project 161. They addressed their main shortcomings, particularly their low firepower and the limited elevation angles of their 76 mm tank guns. Thus, the project included plans to install two 85 mm ZIS-S-53 guns in MK-85 turrets on the boats. However, by March 1945, when the first ten hulls were already in production, the standard turrets had not yet been created. Consequently, it was decided to temporarily install turrets from T-34-85 tanks on the boats. The Project 186 armored boats, which were built at the end of World War II, participated in combat operations in the Baltic Sea, providing fire support to ground forces. By 1947, about 30 boats of this project had been built, and they remained in service until the 1950s.

The MBK pr.186 was introduced in Update 1.79 "Project X". This armored boat has powerful artillery and anti-aircraft weapons for a small coastal, as well as good protection, but it is slow.