AK-47 (Example)

The AK-47, officially known as the Avtomat Kalashnikova, is a gas-operated, 7.62x39mm assault rifle, developed in the Soviet Union by Mikhail Kalashnikov. It is the originating firearm of the Kalashnikov rifle (or "AK") family. 47 refers to the year it was finished.

Even after seven decades, the model and its variants remain the most popular and widely used assault rifles in the world because of its reliability under harsh conditions, low production costs compared to contemporary Western weapons, availability in virtually every geographic region, and ease of use. The AK-47 has been manufactured in many countries and has seen service with armed forces as well as irregular forces and insurgencies worldwide, and was the basis for developing many other types of individual, crew-served and specialised firearms. As of 2004, "Of the estimated 500 million firearms worldwide, approximately 100 million belong to the Kalashnikov family, three-quarters of which are AK-47s".