I just finished installing a trigger spring kit from M Carbo in my friends Kel-tec 9mm, Glock magazine gun. The trigger pull went from 9.4 lb. to just a little over 5 lb. My Kel-tec has a 4.5 lb. trigger after I installed the M-Carbo kit and shot a few hundred rounds through it. Not to hard to install, as M-Carbo has a great installation video on their site.