If you've ever looked at many Suhls and I've looked at and owned a lot of them, they're a study in quality control. Basically, because I don't think they had any formal quality control or if they did it was just lip service. That's the communist system for you. No incentive.
Anyway, if you've looked at a lot of the, you can almost tell which ones will shoot without ever putting a bullet in them. Quite simply the fit of the other parts is better, meaning somebody at least took enough pride to build the thing half way correct. The most telling attribute that I've ever noticed is the loading ramp. If there's a bug space between it and the barrel, most likely it won't shoot. If it's tight and the fit is good and it appears that the fitof the bolt is good and the numbers match, it's usually a shooter. That is, of course, unless somebody else realized the same thing and shot it until the barrel wore out.
Cheap gun with great results if you watch what you're doing.