107 mm gun M1910/30 (, ) was a Soviet 106.7 mm field gun. The gun was based on an artillery piece originally developed by the French arms manufacturer Schneider prior to World War I and used by the Russian Empire as the 107 mm gun M1910. The modernized variant, adopted in 1931, differed from the original design mainly by having a larger chamber and longer barrel, resulting in longer range. The M1910/30 remained in production until the mid-1930s and was employed by the Red Army in World War II, mainly in corps artillery and Reserve of the Main Command units. A number of captured guns were used by the Wehrmacht. Development and production From the late 1920s the RKKA sought to upgrade its First World War era artillery pieces. One of the modernized weapons was the 107 mm gun M1910, originally designed by the French arms manufacturer Schneider. Modernization projects were submitted by Orudiyno-Arsenalny Trest (OAT) and by the design bureau of the Scientific and Technical Committee of the Main Directorate of Artillery (KB NTK GAU). After trials it was decided to adopt the weapon designed by KB NTK GAU, but to fit it with an equilibrating mechanism as used in the OAT project. The modernized weapon was adopted in 1931 as the 107 mm gun M1910/30. The upgrade included the following: The barrel was lengthened by 10 calibers and fitted with a muzzle brake; The chamber was lengthened; Separate cartridge loading was introduced; There were changes in the recuperator, cradle and elevation mechanism. The weapon was manufactured by the Bolshevik Plant in Leningrad and by the Barrikady Plant in Stalingrad from 1931 until 1935 or later. Additionally, a number of M1910 pieces were upgraded by Bolshevik, No 7, No 13 and KKZ plants. Description The barrel of the M1910/30 was longer than the original barrel and was fitted with a slotted muzzle brake (which reduced recoil by 25%); in order to balance the barrel, a special weight was fitted to the opposite end of the tube. The breech was of the interrupted screw type. The recoil system, consisting of a hydraulic recoil buffer and a hydro-pneumatic recuperator, was located in a sleigh below the barrel. The box trail carriage was nearly identical to that of the M1910. It had either unsprung wooden wheels or metal wheels with solid rubber tires. With wooden wheels, the speed of transportation was limited