i put a Chinese star fixed 20 on my first SKS back in the 90's, ran great, as good as the factory 10. Those are too pricey these days. The cheap copies are junk.
Last one I bought had a Tapco 20, and the lips were bent cause the last owner pulled em out on a closed bolt. A new Tapco ran just fine but even with modding didn't load as easy with strippers vs the fixed 10.
I think any removeable mag is gonna have the issue of not being removeable on a closed bolt. That's a PITA. And removing or loading the mag takes two hands, one to pull the release tab, one to remove the mag.
Never tried one but the Archangel mag at least has a built in release lever so it CAN be removed one handed.