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Mechanically, these semi auto Stens are very much like the Cooey Model 64 .22.

I suppose they could be used to check feed, ignition and extraction/ejection when hand cycled.

Does it reliably feed dummy rounds when manually cycled? If it doesn't feed, dry fire, eject and recock when manually cycled, you aren't ready for live fire.
You can test ignition by chambering a...

The IO system does have a good reputation, so it is just a matter of finding the correct balance.

The springs have to be balanced.
Both springs resist the recoil of the bolt assembly.
The bolt return spring must be strong enough to reliably close the bolt. It does this alone, because the...

What operating system are you using?