Wikipedia
PTRD
The PTRD-41 (Shortened from Russian, ProtivoTankovoye Ruzhyo Degtyaryova;Противотанковое однозарядное ружьё системы Дегтярёва образца 1941 года;"Degtyaryov Anti-Tank Rifle") was an anti-tank rifle produced and used from early 1941 by the Soviet Red Army during World War II. It was a single-shot weapon which fired a 14.5×114mm round. Although unable to penetrate the frontal armor of German tanks, it could penetrate the thinner sides of early-war German tanks as well as thinly armored self-propelled guns.