I installed a set of Ashley outdoors pro express bar-dot tritium sights.My first choice was the new Heinie straight 8 sights,but they won't be available until the end of the year.The other thing I did was install a reduced power firing spring from wolfe.I can't say enough about those little springs.It reduced the already good trigger pull of my K40 Elite by another 25%!!!.HOWEVER-wolfe recommends the use of these springs for "competition only".I'm used to carrying all my Glocks with the 3 1/2 # connecters anyway,so it isn't that much of a "shock" to my triggerfinger.I have also heard that replacing the factory 20# spring with a 22# spring and a Harts recoil reducer does wonders for the recoil.But since my fovorite load is the Federal 165 gr @950 fps,I don't need one.But if I wanted to use Cor-Bon or something similar,I would try the spring/Harts pkg.