That's it! Thanks, just wondering. Shoots fine for me!If you are referring to the KMP trigger, that set screw retains the assembly with the spring behind it. I've seen these vary in terms of how deep they are seated in the bar, but I don't think there is any functional adjustment there. You certainly can change how much pre load on the spring, but that will only effect the trigger bar tension and that's unrelated to the "feel" that the shooter gets. I doubt the bar reset changes much with the tension there but, as always, I could be wrong!