What is the caliber of the AK-47?

The AK-47 is chambered for the 7.62x39mm cartridge. This caliber is known for its balance between power and controllability, making it effective for medium-range combat and suited for various environments. The 7.62mm diameter bullet provides significant stopping power, while the 39mm case length allows for a relatively compact cartridge that can be produced with reliability for use in automatic and semi-automatic firearms.

The choice of the 7.62x39mm caliber was deliberate, as it allows for good penetration and effectiveness against cover while ensuring manageable recoil for the shooter, particularly in fully automatic fire situations. This characteristic has contributed to the AK-47's reputation for reliability and ease of use, even in adverse conditions.

Other calibers listed, such as 5.45x39mm, are associated with different variants of the Kalashnikov platform designed for different operational requirements. The 7.62x54R and 9mm calibers are also used in varying military applications but are not related to the AK-47's standard configuration.