Tighten it "snuggly" if you use a new screw tighten it somewhat "snuggly" and then make sure the firing pin still moves then tighten it "snuggly" and check again, (make sure the screws are the same length first)
some people use locktite - -I don't
Most of those people have problems getting the screw back out
I had over 1100 rounds through my gun before I replaced the original screw with a stainless steel one that I blackened and softened ( to eliminate any firing pin damage) and made the following modification to
I am experimenting with an idea as follows, I have about 200 rounds through it with my screw being "finger tight" with a bare 1/4" hex bit using no driver
If the extractor screw (P/N 183) has a flat on the side that the firing pin touches the screw will stay in place?? This would eliminate the need for locktite or tightening the screw excessively and consequently stripping the head.
With a flat, every cycle of the firing pin should reset the position of the screw.
I figure the simplest way to do this is when installing a new screw, install the screw as desired, mark the breach side of the screw, remove the screw, grind a small flat on the screw that corresponds to this mark, install the screw as marked.
I doubt this would work as well with a "factory / soft" screw as it would with a hard button head.