The 1930s trend was to build AT rifles to counter enemy armor, especially the lighter vehicles. Finland followed the suit and just before Winter War in late 1939 the 20mm L-39 AT rifle entered service. It proved to be excellent weapon in it’s class with semiautomatic operation, 10-round clip and capability to penetrate 20mm of armor in 60 degrees angle at a distance of 300 meters. This fearsome weapon weighs 49kg and is 2,24 meters long, making it cumbersome like all other AT rifles. Needless to say it proved ineffective against late-war armor and in the summer battles of 1944 it was modified to shoot down armored ground-attack planes. Curiously, it was retained as an anti-helicopter weapon until 1980s.