For those of you into competition, you might be interested in this trigger system if you use a Glock. My suggestion is to use this ONLY AFTER you give your gun a 1,000 round trigger job amd only on a competition gun. What I like is that it shortens the pre travel. I have not had a chance to shoot one so take this for what it's worth but Mr. Vogel is the current IDPA SSP World Champion (with a Glock.)
http://www.glocktriggers.com/