I have had a similar experience more than once over the years. It might have been caused by tight chambers but I am not sure. After firing, the hulls expanded and it was near impossible to get the gun open. Banging it over the knee worked. I think it was the plastic but cannot be sure. Your description of opening slightly is why I think this is the case. If it was mechanical I think it would not budge however if you try over the knee and it does not move then it might be mechanical.
If the firing pins are stuck because the pins are a bit long, banging over the knee works also.
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