I have a G21SF for home defense and a G36 for IWB concealed carry. I ordered and installed Ghost connectors in both of them last week. In my G21SF I installed the Ultimate 3.5 connector kit including 6lb trigger and fireing pin springs and light fireing pin safety spring. In my G36 I installed the ranger 4.5 connector kit with 6lb trigger and fireing pin springs and light fireing pin safety spring. They both dry fired really smooth and felt just right for each application. Today I took them to my local range and fired over 75 rounds thru each. Mostly 230gr FMJ, but enough HP's to make sure they fire OK. I couldn't be more happier with both of them. The G36 has a nice smooth chrisp feel, not too light for safety. The G21SF was even more smooth with a pound less pull. My marksmanship immediately improved 100%. I have always had a problem with low and left. Well, that problem is all but gone. Both guns fire so smoothly that I can keep right on target without any problem at all. I am not rying to become a Marksman, but just to be able to defend me and my family is ever necessary. I now have the confidence to do that. These Ghost connector kits are really great.