The original AK-47 chambering was 7.62x39mm. Other AK calibers include .308 WIN, .35 REM, .222 REM, .223 REM, 7.62x54R, 5.45x39mm (AK 74), 9 mm, 9x39mm sometimes called 9×39 GROM, 6.5 Grendel and even .22 rimfire. Generally, AK ammo is imported but readily available.