The AK-47 is the first mass-produced, Kalashnikov-patterned assault rifle. It was designed in 1947 by Mikhail Kalashnikov, and was first used in 1949. With millions produced, it was the first model of the world's most abundant weapon.
The AK-47 is outclassed by other weapons at range and accuracy. However, the AK prevails in high damage, whilst maintaining unmatched ammo efficiency in it's class.
With a massive mod pool, the AK-47 has 105 unique modifications. Combining it with supported vanilla attachments, custom attachments, and other AK Pack modules, there are literal thousands of possible combinations.