Chris, first I commend you on an excellent thorough test of all the connectors. I believe your test only goes to prove what us Armorers have known for quite some time now. There is NO "drop in" 3.5# connector. I have been doing Glock actions for years now and there is NO magic pill, NO snake oil, NO lightened super-duper connector that will do the job all by it's self. And you have also shown what I have seen as well for years; the 5.5# factory trigger is also not a standard. Now all that said I will admit that the Gen 3 and especially Gen 4 Glocks just aren't the same as earlier models. Can these models be brought down to 3.5# trigger pulls? ABSOLUTELY, but it takes some time and work. I have been in contact with a spring manufacturer and if their schedule allows we are going to start looking at several variables. Things as simple as the number of turns, but then going into tensil strength, and wire diameter in various tensil strengths as well. Your test I personally believe goes to show the caliper of craftsman and gunsmith you are and I also think it goes to show why Glock.Pro is THE Glock forum for the true Glock owners.