My 92fs was very difficult to fire out of the box. So I bought the Wilson Combat Steel Short Reach Trigger - Item# 635, and the Wilson Combat Reduced Power Conversion spring - Item# 644. That helped significantly, but I still didnt have that light pull, smoothe as butter feel that I was after. So I replaced the stock hammer spring with the Wilson Combat Reduced Power Hammer Spring #13. WOW what a difference that made. While you are changing the spring, I also encourage you to get the Wilson Combat Mag Guide - Item# 676 - as you will have to pop out a pin that hold the factory plastic hammer spring retainer in place. For such a critical aspect of the gun, Im very displeased at Berettas use of plastic to hold the hammer spring in place! Removing the hammer pin was easy! Just get a very small screw driver or punch and push it out. Make sure you keep your hand under the gun as the hammer spring is under a lot of pressure and will go flying! Then install the Reduced Power Hammer Spring and Mag Guide. To get the hammer pin back in place, with one hand push upwards on the mag guide. Then with the other put in the hammer pin. I had to kind of wiggle it a bit until it went into place. It was really one of the easiest things I have replaced yet! It was about a 5 minute job!
My stock 92FS was no pleasure to shoot, even in single action. I installed a factory Beretta rear target sight and the following Wilson Combat items: steel trigger, lowest power hammer spring, lowest power trigger return spring. For around $130, its now a far better gun and my groups have shrunk in half with no more tendency down and to the left. Single action is really nice and crisp.