The gun pictured is a rare and highly sought-after Sturmgewehr 44, or StG44, assault rifle. It was developed by Nazi Germany during World War II and was the first assault rifle to be mass-produced. The StG44 was a revolutionary weapon that combined the firepower of a machine gun with the portability of a rifle. It was used by German troops on all fronts during the war and was a feared weapon by Allied soldiers. The StG44 is considered to be one of the most influential firearms in history and has been copied by many other countries.