The StG 44 (abbreviation of Sturmgewehr 44, "assault rifle 44") is a German assault rifle developed during World War II by Hugo Schmeisser. It is also known by its early designations as the MP 43 and MP 44 (Maschinenpistole 43 and 44). The StG 44 was an improvement of an earlier design, the Maschinenkarabiner 42(H).

The StG 44 was the first successful assault rifle, with features including an intermediate cartridge, controllable automatic fire, a more compact design than a battle rifle with a higher rate of fire, and being designed primarily for hitting targets within a few hundred metres. Other rifles at the time were designed to hit targets of over a thousand meters, but this was found to be in excess of the range in which most enemy engagements actually took place.

The StG 44 fulfilled its role effectively, particularly on the Eastern Front, offering a greatly increased volume of fire compared to standard infantry rifles. The StG largely influenced the Soviet AK-47, introduced three years after the war concluded. The StG's influence can still be seen in modern assault rifles, which, after World War II, became the global standard for infantry rifles.

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