Before you totally abandon the idea that the sear bar is a problem, check to be sure the disconnector is moving freelky and properly. It's the little spring loaded plunger in the front end of the sear bar. On my Mauser re-intro the upper end of Swiss trigger lever did not move quite far enough back into the side plate and the disconnector would not ride over when the trigger was released as it is supposed to do.
If the disconnector is dirty or rough and hanging up, the cannon will still **** and fire as expected when you press the sear bar.
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