I'm totally frustrated by this trigger mechanism. It fires the first barrel OK (whichever one is selected) but will not switch to the second barrel. All is clean. The right sear seems to be a little rougher than the left one. I have tried to polish the sear pin and the sides of the action where the sears slide but I don't think that would have anything to do with the malfunction of the trigger mechanism. Any ideas? Many thanks!

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