They did when I was in 2nd Marines. I remember several days straight of COMBLOC weapons training. AKs, RPKs, SVDs, RPG simulators, various sidearms, grenades, landmines, artillery munitions, etc.
The light weapons were all 7.62x39 and 7.62x51R, except for one static display of an AK-74 in the newer cartridge that there was no ammunition for.
I should be part of BASIC TRAINING at boot camp..........ASAP!...........