I will suggest that you check one more thing which I have encountered on two Model 19's over the years. It's RARE but I have two 19's that have the Coke (target) style factory grips on them, and the grip screw is SLIGHTLY in the wrong place (too far forward) causing the main spring to hit it. When this occurs, the spring will not come back to develop its full power. In double action mode the hammer falls slightly before it does when in the single action mode creating less of a force to ignite a primer. Now being that I personally have two 19's with this situation, I know there are others out there. Both of my guns fired 100% single action, but did FTF quite often on DOUBLE ACTION before I fixed them.
OK, so here is the fix IF your 19 falls into this category. I had to modify the grip screw by decreasing the diameter in the middle section so that the spring no longer hit up against the screw shaft - this in turn allowed the spring full movement. When you are done with this modification your grip screw kind of looks like a barbell, thinner in the center, larger on both sides. Another fix is to try a different set of grips, but in my case I like the Coke grips.
IF this is not he case with your model 19, I would make sure the strain screw is all the way in and tight. I would also check to see if someone cut the screw or ground it down causing the spring to develop less power. If that does not apply to your situation, then I would replace the main spring.
regards,
chief38
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