Not opening may be the shell rims sticking in the rim recesses, especially if you're using Win AA hulls, which are generally out of round. Been there. The safety on my 28ga Repro gets stuck if I use the gun in wet weather. I have to work it by pressing it against a tree, which is no fun. Once the gun dries out it's fine again. I do not know the exact issue as I have not taken it apart, but I'm guessing it has to do with the safety link binding in the swelling wood somehow.
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