On July 6, 1947, the AK-47 went into production in the Soviet Union. An excerpt from the article:
"The name AK-47 is derived from the Russian words “Avtomat Kalashnikova”, in honor of its automatic firing capabilities and its principal designer, Mikhail Kalashnikov. The 47 denotes the year 1947, when the trials started on the version of the rifle that was finally approved for adoption by the Soviet armed forces soon after.
By any measure, the AK-47 is the most successful assault rifle in human history. In terms of the number of guns produced, duration of service, and worldwide deployment, it has no equal.
The genius of the rifle is not that it was original. It is actually an amalgamation of several preexisting design concepts. The trigger mechanism, safety catch, rotating bolt, and gas-driven action borrowed heavily from other firearms. But these features were combined with a platform that offered legendary durability and low manufacturing costs.
The result was a lightweight rifle with moderate recoil that was easy to wield and that still placed tremendous firepower into the hands of individual soldiers. Accuracy was a secondary consideration. The fact that it gave soldiers the ability to deliver massed fire in an effective fashion was what made it unlike any other rifle before and, some would still argue, ever since."