Aber 72L-28 Soviet 45 mm 20K tank Barrel for BT-5, BT-7, BA-6

Cannon W-Z cake. 1932 (20K) caliber 45 mm is a tank gun caliber 45 mm from the interwar period and World War II of Soviet production. The barrel length of this gun was 46 calibers, or 207 centimeters. The cannon entered service in 1932. The average initial velocity of a shell fired from this gun was up to 760 m / s, and the maximum range was about 4,400 meters. With a well-trained crew, the rate of fire was 12-15 rounds per minute. The presented gun was a relatively simple development of the anti-tank gun wz. 1932 (19-K) of the same caliber. In 1934 it was modified to become a de facto semi-automatic cannon, and from 1938 it also had an electric firing system and a primitive vertical stabilization mechanism. When firing APCR (Armor Piercing, Composite Rigid) ammunition, i.e. a full-caliber anti-tank missile. with a hardened core, wz. 1932 (20K) caliber 45 mm was able to penetrate an armor plate 94 mm thick at a distance of 100 m, 64 mm at a distance of 500 m and 40 mm at a distance of 1000 meters. The gun was the main armament of the BT-7 tanks and several versions of the T-26 tank. It was also mounted on T-35 tanks or BA-5, BA-6 or BA-10 armored cars.

3_abe72L-28_instruction_sheet.pdf