M1931 (B-4) 203mm Howitzer WWII

The Zvesda M1931 (B-4) 203mm Howitzer WWII (part number HC-Z3704) highlights the formidable Soviet heavy howitzer developed in 1931. With a 203.2 mm (8 in) calibre and the ability to launch shells weighing over 100 kg, the B-4 delivered devastating firepower across significant distances, earning a fearsome reputation on Eastern and European fronts.

Historical Overview

Designed as a high-power siege and assault gun, the B-4 could strike targets at almost 18 km. A special caterpillar carriage with a wide tracked footprint prevented the weapon from sinking on soft ground and helped absorb the massive recoil. The B-4 first saw combat during the Soviet–Finnish War of 1939–40, where it was employed to demolish concrete fortifications, leading to its nickname “Stalin’s Sledgehammer.” Captured examples were pressed into German service as the 20,3 cm H.503 (r). The howitzer continued to serve throughout WWII, proving effective in storming fortresses and in street fighting in large German cities.

Key Facts

• Calibre: 203.2 mm (8 in)
• Shell weight: over 100 kg
• Maximum range: almost 18 km
• Transport weight: approximately 19 tonnes
• Special caterpillar carriage with wide tracked surface
• First combat use: Soviet–Finnish War, 1939–40
• Nickname: “Stalin’s Sledgehammer”
• German designation for captured guns: 20,3 cm H.503 (r)
• WWII service: fortress assaults and urban combat in major German cities

This Zvesda HC-Z3704 M1931 (B-4) 203mm Howitzer WWII offers a detailed focus on one of the most powerful artillery pieces of its era, renowned for its role from the Winter War through the closing battles of the Second World War.