I wasn't aware I was jumping down anyone's throat. I went to there site and measured my finger as they suggested and that info suggest an F4. I just wanted to know what was closest to what I had stock for comparison sake was all. I like the reach of the factory trigger but would like to have a flat faced trigger and wanted to keep the reach about the same. I'll go with the F3 based on the info you stated above. Again, thanks for the help.