7.5 cm Pak 41
The 7.5 cm Pak 41 was one of the last German anti-tank guns brought into service and used in World War II and notable for being one of the largest anti-tank guns to rely on the Gerlich principle (pioneered by the German gun-designer Hermann Gerlich, who developed the principle in the 1920s, reportedly for a hunting rifle) to deliver a higher muzzle velocity and therefore greater penetration in relation to its size. It is similar to, but distinct from, the Waffe 0725, which, while also based on the Gerlich principle, had a different barrel calibre.