I just sold a Gen 4 FDE 19 that I had tricked up. I am a lefty, don't care for finger groves and didn't like the fact that the slide lock/slide release is not available for left hand operation. I have been trying to go to pistols that work well for left handed shooter thus I now have a Gen 5 Glock 45 and an M&P 2.0 compact that I am working with.