The AK and its variants have been produced in a number of calibers:
.22 trainers
7.62x39 the original AK 47
5.45x39 the AK 74
5.45x45 which uses our .223 round
7.62x51 also known as nato.308
7.62x54
8mm mauser used in the yugo m76
410 shotgun
20gau shotgun
and
12gau shotgun