. Granatnik wz. 36 - Wikipedia. 
. Brushes and Bayonets...: FoW: Mortars and Grenade Launchers Obrona Narodowa (National Defence). Granatnik Szustra – Wikipedia, wolna encyklopedia. Granatnik Łopuskiego – Wikipedia, wolna encyklopedia
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nice
Thats functionally a 50mm mortar. Im not sure that adds anything to the game, esp with US and Japan still missing 80mm variants.
" In comparison to other light mortars of the period such as the German 5 cm Granatwerfer 36 or the Soviet RM-38, the Polish mortar was less accurate and the grenades used had a smaller warhead, however it was lighter and easier to handle and assemble. Also, thanks to the firing mechanism the weapon could be preloaded and fired immediately upon sighting a target"
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During the Warsaw Uprising, in order to reduce the “hunger” for weapons, the Polish side undertook the production of several types of weapons, one of them was a mortar – a grenade launcher made of a sewer pipe. It was created in a gunsmith’s shop located in the so-called “Egg Factory” at 51 Hoża Street, in the buildings of the Union of Dairy and Egg Cooperatives.
The creator of the idea of engineer Mieczysław Łopuski a.k.a. “Konstruktor”. During the uprising, about 25 pieces of this weapon were made. They were used in battles in the area of the University of Technology, “Pasta” on Zielna Street, and Piusa Street.
This weapon consists of two elements: the base and the barrel of the mortar. The base comes from one of the later specimens, initially wider ones were used, but they were impractical because it could not be carried through holes in the walls or barricades. The base to weaken the recoil was attached to the ground. The barrel comes from one of the first copies – it does not have a device for tilting the bottle with sulfuric acid initiating the shot – the acid was dripped directly through the hole. The last copies use electric ignition. The barrel length was about 1000 mm (later models were about 1200 mm), the caliber was about 80 mm, the range was about 600 m, in the practice of urban combat it was shot at a shorter distance. Unlike classic mortars, due to the shooting of grenades of underground production, the weapon is breech-loaded. Together with the grenade, slats were inserted to stabilize the flight of the projectile and fill the space between the grenade and the barrel. Then the propellant charge was inserted and the weapon was fired.
The ammunition used in the grenade launcher were cylindrical grenades of insurgent production, also produced at 51 Hoża Street, designed by engineer Eugeniusz Żochowski and Tadeusz Chęciński, MA. It was made of a 3 mm thick steel pipe. The crushing material was potassium chlorate with a 5% admixture of sugar, metal offcuts and nails were also placed inside the pomegranate. Garnet height: 126 mm, diameter 70 mm. This type of grenade was also used as a throwing grenade. The mortar also fired egg-shaped “defensive” grenades made of a massive cast, transversely and longitudinally notched shell – however, due to the large slack in the barrel, they had a lower range and worse accuracy.