That'd be why you have to inspect any weapon you're going to buy. Even Colt makes a few lemons here and there.
The quality of an AK has a lot to do with how well the parts were put together and if you don't own a machine shop you can't simply pop a few pins and unscrew parts like you can with an AR.
Lately many companies have been slapping parts together as fast as they can and shipping them, QA be damned, and unfortunately Century is not an exception.
The demand for firearms is, strangely, still incredibly high.