Unintended consequences--Just bought a new Gen 3-19--made the same "improvements" I have made to the other 15 Glocks I have owned (Only 4 now). Different than before was that I put a 17 smooth trigger W/bar in it and a Titanium Firing Pin Safety. I used the old spring in the safety instead of the new one. Also 3-1/2 connector and polished all surfaces of the connector group that touch. The other 14 guns those connector/polishing steps were all I did. Just went to local range to put a quick 100 thru it and bang-bang--it double taps for me--whether I want it to or not. Any ideas what did I do wrong here?