Could this possibly be one of the "$hithole countries" that Trump mentioned? I would suspect all those guns are carefully cleaned after a hard day's fighting...
kjohn, I've seen AKs and SKSs thrown into honey pits and sloughs, left there for several months and retrieved.
They were usually soaked overnight in Diesel/Gasoline or just boiled in hot water to remove the crud. The they tried cocking it. If it wouldn't budge by hand, they used a block of firewood and a hammer to break the bolt free.
Then, if it needed it, back in for another soak.
A straightened coat hanger made a great bore obstruction cleaner and later, maybe a piece of cloth, soaked in Diesel fuel to swab the bore.
Slip in a magazine with a few rounds, and shoot out anything that might still be in the gas tube or piston.
They seldom disassemble those rifles, because if they broke or lost a part, there was nothing immediately available to replace them.
They mostly went bang every time. They weren't accurate beyond 50 meters, maybe a 15-20 cm group at that extended range.
Often they wouldn't operate in semi auto or full auto mode and the actions had to be manually cycled after each shot.
The AKs in those photos actually look to be reasonably well maintained.