The Ak magazine is the "Tank" of firearms magazines, and is justly famous for having no weaknesses.
What isn't commonly known is that Kalashnikov deliberately designed in an extra amount of room, then designed the follower to act as a positive stop.
It's not possible to overload an AK magazine because of this feature, and because the magazine already has the extra space, the spring is subjected to much lower stress.
People regularly load AK mags up to full capacity and leave them loaded for decades with no feed problems.
Remember, Kalashnikov designed the entire rifle/magazine system to the Russian standard of a weapon that would be foolproof when used by an illiterate peasant. That's why the magazine is so strong. It's only "weakness" is the heavy weight.
Unless an AK magazine has obvious damage, they give zero feed problems.