Can I use that stinking screw or not to adjust trigger pull?

[catadjuster]

I had a similar problem

So my latest Perf Ctr 627 has had four (4) failure to fires out of 300 rounds from light primer strikes. One FTF was with American Eagle and I thought it was from being old ammo, then I had three more FTF's from Remington Golden Saber .357 Magnum

Used to I would of dropped the grips and backed out the screw that is pressing in to the spring right? Now I'm reading not to do it, that screw is supposed to be fully seated, and spring adjustments should come from the installation of slightly shorter ones if you need more hammer force.

Problem is, I don't know if the issue is head space or spring adjustment or what.

What is my next step please?

Thank you

I received a 627PC that had 7% failure to fire due to light primer strikes. I called S&W and they sent me a shipping label - sent the gun off. It returned with a new firing pin, new cylinder and new crane. That would not have been a repair that I would have been willing to undertake at home, but I don't think that they would have performed those operations had they not been necessary to repair the underlying problems that lead to the light primer strikes.

S&W has a lifetime warranty on these guns and they charge enough for the gun that it should either work properly or be repaired. My advice would be to call customer service and explain what you are experiencing with this gun and see if they advise a return to the factory.