- Years of issue – 1940 – 1941
- In total, more than 30,000 units were produced.
- Caliber – 50 mm
- Weight in firing position – 9 kg
- Calculation – 2 people
- Rate of fire – 32 rds / min
- The greatest firing range – 800 m
- Direct shot range – 60 m
- Shooting angles:
- Horizontal – 8 °
- Vertical + 45 ° + 82 °
During the Soviet-Finnish war of 1939 – 1940, a number of shortcomings of the 50-mm company mortar of the 1938 model were revealed, so it was required to significantly modernize it, improving both operational and technological characteristics. The new mortar was developed in SKB-4 at the artillery plant number 7 “Arsenal” them. Frunze (Leningrad) by V.N. Shamarin in 1940 and was an improved 50-mm company mortar of the 1938 model.
While maintaining the general design and principle of operation of the 1938 mortar model, the new mortar model took into account the experience of the production of company mortars and their use in the troops. Since there were repeated cases of mortar burns with powder gases coming out through a remote tap, the mortar plate received a cover (visor), which protected the calculation from hot powder gases. The board itself was now produced using a high-tech deep stamping method.The design of the remote crane was significantly simplified by reducing its length, which made it possible to reduce the dimensions of the entire mortar while maintaining the length of the barrel bore. The release of more powder gases with a fully open valve made it possible to reduce the minimum firing range to 60 m. The shock absorber now consisted of only one cylinder, closed from dirt and dust by a swivel mechanism. The scale of the remote crane was also changed, which now corresponded to the new firing ranges. The design of the two-legged carriage and its mechanisms was also simplified, which was now made from sheet steel by cold stamping.
In general, the company mortar of the 1940 model of the year differed from the mortar of the 1938 model in its lower weight (by 25%), greater manufacturability and ease of use. The ammunition load of the 50-mm mortar of the 1940 model was similar to that of the company mortar of the 1938 model.
50-mm company mortar designed by V.N. Shamarina successfully passed military trials during the Soviet-Finnish war in January 1940 on the Finnish front at the location of the 85th Infantry Regiment of the 100th Infantry Division and was soon adopted by the Red Army under the designation “50-mm company mortar of the 1940 model.” … Along with carrying a company mortar in human packs, the experience of this war showed that a drag (boat) is a good tool for transporting mortars through snow and swamps. Due to the high manufacturability of the new 50-mm mortar in 1940, it was possible to organize its mass production at many machine-building enterprises of the Soviet defense industry, including: factories No. 7 (Leningrad), No. 221 “Barrikady” (Stalingrad); “Krasny Profintern” (Krasnoyarsk) and others.
On June 22, 1941, 17330 50-mm company mortars of the 1940 model were manufactured in the Soviet Union. In 1941, their production was continued and more than 13,000 mortars were produced. 50-mm company mortars of the 1940 model were widely used in the Red Army at the beginning of the Great Patriotic War.