page_title: 152 mm howitzer-gun M1937 (ML-20)
section_title: Variants
hierarchical_section_title: 152 mm howitzer-gun M1937 (ML-20) / Variants
caption_attribution_description: Polski: 152 mm haubicoarmata wz. 1937/85
context_page_description: The 152 mm howitzer-gun M1937 (ML-20), is a Soviet heavy gun-howitzer. The gun was developed by the design bureau of the plant no 172, headed by F. F. Petrov, as a deep upgrade of the 152-mm gun M1910/34, in turn based on the 152-mm siege gun M1910, a pre-World War I design by Schneider. It was in production from 1937 to 1946. The ML-20 saw action in World War II, mainly as a corps / army level artillery piece of the Soviet Army. Captured guns were employed by Wehrmacht and the Finnish Army. Post World War II, the ML-20 saw combat in numerous conflicts during the mid to late twentieth century.
context_section_description: The barrel was manufactured in two variants − monobloc or built-up. Some sources indicate that a third type - with loose liner - also existed.
  Except the basic variant, the only variant to reach mass production was the ML-20S, developed for use in self-propelled guns, with differently placed controls for easier operation in small enclosed compartments.
  ML-20 with bag loading – In 1937 the Main Artillery Department decided, for economic reasons, to modify medium caliber guns to use bag loading instead of cased loading. An experimental ML-20 piece was built in 1939; the trials were unsuccessful.
  ML-20SM – Modified ML-20S with identical ballistics. muzzle brake was removed. The gun was mounted in the experimental ISU-152 model 1945, of which only one unit was built.
  BL-20 – ML-20 with cast breech and wedge breechblock. Was developed by OKB-172 (sharashka of the NKVD) in 1946.
  ML-20 with M-46-type carriage – ML-20 with a modified carriage, resembling in construction a carriage of the M-46 130 mm gun. In 1950 an experimental piece was built and tested.
  152 H 88-37 – A Finnish modernization program
  152 mm haubico-armata wz. 37/85 – A Polish modernization, tires from KrAZ-255B truck, new compressed air cylinder and automotive lighting increased the road speed of the towed gun from 20 to 50 km/h and allowed the gun to be towed on public roads.
caption: Polish 152 mm howitzer-gun wz. 37/85 Lubuskie Military Museum
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