So I am thinking the grips made a difference. With the Ahrend's yesterday I had misfires in 3 of 50 rounds. Today using the factory grips I had 2 of 100. So either I have a weak main spring or maybe the firing pin is just a bit short. I was going to try the spent primer thing, but there's not enough clearance between the main spring and the frame. I'm going to look around for something else to use as a shim.
