I have two Norinco (Chinese) 75 round drums. Top quality!
You can fully load them, press the spring release to take the tension off of the spring, and just wind them up when ready to fire.
IME, Chinese Ak,SKS, MilSurp ammo and equipment is superior to Warsaw Pact. The Chinese army gets the very best the country can offer. Their military is their number one priority.
And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.