The German FG42 (Fallschirmjägergewehr 42) was a rifle designed as a multi-role combat small arm for airborne troops that was part rifle and part light machine gun. Only about 10,000 were made during WWII, but the design was very influential after the conflict ended (especially in the USA).
A company In Decatur Texas is now reproducing these guns in semi-auto only configuration, and in this video we put one to the test!