A conversation I have about twice a month:
Q: My SPAS won't cycle properly in semiauto mode. Is it broken?
A: It might be, but have you tried any full-power shells in it?
Q: I've shot some target loads and turkey loads, I just don't think that is the problem. What's wrong with the gun?
A: Shoot some buckshot or slug loads, regular or magnum through it.
Q: Oh, I just know that's not the problem, besides I'd have to buy some and go to the range and all that. How else can I fix my broken gun?
A: Shoot some buckshot or slug loads, regular or magnum through it!!!!
Q: I don't want to! Any other ideas?
A: I'll offer you $100 for the poor old broken thing.....
From the User's Manual:
to SPAS Technical Information