The StG 44 was adopted by the Wehrmacht in 1944. It fires the 7.92×33mm Kurz round. Currently the most used assault rifle in the world along with its variants, the AKM and the AK-74, the AK-47 was first adopted in 1949 by the Soviet Army.It fires the 7.62×39mm M43 round. The M16 was first introduced into service in 1964 with the United States Armed Forces. More @Wikipedia
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