Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: Together with its derivatives, the Kalashnikov rifle has been used by the police and armies of 55 countries and an assortment of guerrillas, terrorists and just plain thugs around the globe. Seventy-five million copies of the rifle have been built since it entered production in February 1947, making it history's most widely distributed weapon.

used