The AK47, or AK as it is officially known (also known as the Kalashnikov) is a selectivefire (semiautomatic and automatic), gasoperated 7.62×39 mm assault rifle, developed in the Soviet Union by Mikhail Kalashnikov. It is officially known in the Soviet documentation as Avtomat Kalashnikova (Russian: Автомат Калашникова).

Design work on the AK47 began in the last year of World War II (1945). In 1946, the AK47 was presented for official military trials, and in 1948, the fixedstock version was introduced into active service with selected units of the Soviet Army. An early development of the design was the AKS (S—Skladnoy or "folding"), which was equipped with an underfolding metal shoulder stock. In the spring of 1949, the AK47 was officially accepted by the Soviet Armed Forces and used by the majority of the member states of the Warsaw Pact.

Even after almost seven decades, the model and its variants remain the most popular and widely used assault rifles in the world because of their substantial reliability under harsh conditions, low production costs compared to contemporary Western weapons, availability in virtually every geographic region and ease of use. The AK47 has been manufactured in many countries and has seen service with armed forces as well as irregular forces worldwide, and was the basis for developing many other types of individual and crewserved firearms. As of 2004, "Of the estimated 500 million firearms worldwide, approximately 100 million belong to the Kalashnikov family, threequarters of which are AK47s".

https://en.wikipedia.org/wiki/AK47

How an AK47 works
   • How an AK47 works  

Don't try to recreate what you see in this video, as this is gameplay. This video was created using the game World of Guns:
http://store.steampowered.com/app/262...
This game is also available on Google Play, App Store, Amazon and other platforms.