37 mm anti-tank gun M1930
1-K
37 mm anti-tank gun model 1930 (1-K) was a Soviet light anti-tank gun used in the first stage of the German-Soviet War. Wikipedia
Muzzle velocity: 800–850 m/s (2,600–2,800 ft/s)
No. built: 509
Recoil: Hydro-spring
Shell: 37 × 250mm R