Are the primers in the shells you are using copper, brass or steel? It certainly sounds to me like your hammer is not rebounding (if it is late enough to have rebounding hammers) and the the firing pin is hanging in the primer. It's almost always one barrel as opposed to both. If I'm using Winchester one of my guns will open fine with the right barrel fired, but if the left is fired it sticks. Never happens with RST (steel primers), Always happens with cheap Winchester. Inspect the impression in your fired cases. I suspect you'll find one is much deeper than the other.
Dry fire the gun then take it apart without cocking it and inspect the firing pin protrusion and whether they easily push back into the frame or if one is much stiffer.
While I can expect my gun to hang up everytime, I choose not to tear it apart, but, just shoot quality ammo.
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