These do seem to vary according to the gun you're working with. These guns were all made before CNC machining became the standard for gun manufacturers. I think there is probably some variance between SKS's made in the same country. It's a lot easier to file a little plastic down to relieve a too tight fit than it is to add material to a loose fit.
As I recall, I had to do the same to mine and now it fits and looks great.
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