These Trijicon Glock Suppressor Night Sights are not compatible with the Gen 5 Glock 20. We do carry the Trijicon Suppressor height set that is compatible with the Glock 20, which can be found linked below:
https://www.opticsplanet.com/trijicon-glock-suppressor-night-sight-set-white-outline-green-lamps.html?_iv_gun-model=glock-20
Yes, these Trijicon Glock Suppressor Night Sights will be compatible with your Glock 23 and provide a co-witness with your Holosun 507C.
The Trijicon Glock Suppressor Night Sights would actually almost provide an absolute co-witness, assuming you have an MOS model Glock and using the RMR adapter plate. If you have an RMR cut slide, they will provide an absolute co-witness.
Yes, the Trijicon Fits Glock Suppressor Night Sights will work with a Glock 19 Gen 4.
The Trijicon Fits Glock Suppressor Night Sights can be mounted to a Glock 17 MOS with a Holosun 509T. You will be able to achieve a lower 1/3 cowitness.
Yes, you will be able to co-witness the Vortex Venom with the Trijicon Fits Glock Suppressor Night Sights on a Glock 34.
Yes, these Trijicon Fits Glock Suppressor Night Sights will fit a Glock 45 MOS.
Yes, the Trijicon Fits Glock Suppressor Night Sights will work on a Glock 17 MOS.
Yes, these Trijicon Fits Glock Suppressor Night Sights will work for a Glock 34 Gen 3.
The Trijicon Suppressor Night Sights will not work for a Glock 48. You can, however, use the Trijicon DI Tritium and Fiber Illumination Night Sight set found using the following link.
https://www.opticsplanet.com/trijicon-di-night-sight-set.html?_iv_gun-make=glock&_iv_gun-model=glock-48