Seeing as you ask, why not!!
One of the original sight and the small diameter 5.5mm peephole (made by me), and another of the larger "close range" 7mm peep-hole I made, on the Redhawk.
As you can see my blueing was not as uniform as the standard painted sight, but dark enough to show the glow-in-the-dark paint I've used.
Also the maching is not pretty to the metal worker's eye, but all was done by hand with either a small dremel type thing or hand files.
The main thing is that the sight hole is central and concentric, and the lugs fit the sight carrier so I can live with slightly uneven edges here and there.
When the right to effective self-defence is denied, that right to self-defence which remains is essentially symbolic.
Freedom: Please enjoy responsibly.
Any idea that relies on murder for its survival in intrinsically weak.