THANK YOU -possible mystery solved?...

My personal B40 has always been slower than it should be... Every one I've tuned for others goes to 900+ right after the tune. Mine would struggle to hit 840 with the same combination.

I thought I had tried everything-Breach seals,piston seal(s) & various springs....I saw no reason to check the captured O ring at the compression tube. But there you have it-an obvious solution.

I will tear it apart & have at it later....I expect to find the same issue as the symptoms sound identical.

Thanks again!!