Thanks to all who replied. Trijicon night sights will be installed. I installed them on my 17 and love them. I'm not sure of anything else I could do with it? As far as any other customization I may just leave it alone as I plan to make this my EDC. I have a holster that works with my 17 and 27 but the holster is just a bit oversized with the 27. Still works though.