3-dot tritium sights

Hi, first time posting. I'm sure this has been discussed, appreciate if someone can point me to the thread or give me a website URL, etc. I have both a 1st Gen PT-111 Ti Millennium (9mm, 10 rnd mags), and a 3rd Gen PT-111 Ti-12 Mil Pro (9mm, 12 rnd mags, plus a backup 17 rnd 24/7 mag [thanks...