This 37 mm Anti-Air gun was successful on the Eastern front vs German dive-bombers and low flying aircraft. It was also used against lightly armored ground targets.
Its effective firing range was 4 km, its maximum range was 5 km and it fired 160 to 170 rounds a minute. The 61-K 37 mm fragmentation shell weighed 730 grams, 770 grams for the amor piercing version. Around 20,000 units were built from 1937 to 1945.
