No the SD sights are NOT luminous, you even have to paint the white on them yourself....
Although...
http://www.uncompany.com/pageproduct...p?prodid=27732
This is light collecting type, much like the stock TM G17 night sight....not real Tritium...
Once you install the metal slide you'll want to get recoil spring also, though I am sure the Guarder one includes it. You may want to install the hammer spring as well, I was already getting light strike with the long mag at around ~78 degF Ambient temp....
Personally I stop spending money on high flow valve, you can mod them yourself, and to get one for every mag(I have 7) is not cheap....
Whats the difference between the 2 piston head?
When you do get the Guarder frame you may want to take a look at front screw post in the frame, for mine at least it had some molding defect:
http://www.pbase.com/racingmaniac/image/127026378
This point is already a highly stressed spot for normal Glock. I ended up reinforcing mine with added JB weld....