A word of caution about a GHOST trigger kit (EDIT: see comment #33). I have two objectives with this post. 1) To find out if anyone else has experienced this. 2) Put this out there as a warning in case you are considering this kit. I purchased a GHOST kit for my Gen4 19 which included the following. ~GHOST 3.5 lb trigger connector. ~ 6.0 lb trigger spring ~ 4.0 lb firing pin spring ~ reduced power firing pin safety plunger spring <<== I knew from the name of this, I wasn't going to use it. [This is what Ghost calls these parts, I'm not sure if you armorers would agree that these are correct terms or not] I had already decided when I bought this kit that I would forgo the installation of any of the springs, with the exception of the trigger spring—I did add that—turns out, that was the problem. What it did to my gun: While fiddling around with my gun one night, I noticed that if I pulled the trigger in slightly and let off, it wouldn't return fully or sometimes it would return but not quickly and crisply. It was like it didn't have quite enough spring to return it—and it turned out that was the case. I don't mean completely depressing (dry firing) the trigger—but pulling it in about 1/8th of an inch and releasing it. It was almost like it was gummed up inside or something. Sometimes you could pull in on it and release and you could watch it slowly return, other times it would not return at all and other times it would seemingly return normally. If the trigger didn't return, it left the trigger sitting in the position where the trigger could potentially be fully deployed by just snagging on the inside of a holster or whatever. The bottom line is: when and if the trigger didn't immediately return, it was as if the trigger was not in the "safe mode" (or whatever you call it). I changed the trigger spring out and put the original one back in and it corrected the problem. I tell you this because I feel it could potentially be a life-endangering situation! Or, maybe I got a bad spring, I don't know. Anybody else have this happen?