That is not what I've read (I've never personally sent an AK back to Century). It's not that every Century AK I've had was perfect, it's just that I found the issues mine had (worn out recoil spring, canted sights, badly fitted dust cover), were easier/cheaper to fix myself. YMMV.

From what I've read, Century will generally fix a gun that won't function, but will usually not correct issues that do not prevent the gun from functioning. For example; canted sights, excessive magazine wobble (unless it results in feed issues), inaccuracy (unless it prevents the AK from firing 6" or better groups with at least one brand of ammo), etc.

My experience with Century service on CETME's (several years ago), was far from positive. They used a ground bolt to create a false bolt gap (too long a discussion for this post, but a potentially dangerous condition). At that time, they refused to correct the problem, or even acknowledge there was a problem (I have read that this has since changed). Bottom line, I ended up buying a new bolt and locking piece. Just to fix a problem that Century should have prevented simply by replacing the worn out locking piece, which would have actually resulted in a correct bolt gap, instead of grinding the bolt (to make it look like it was correct).