Glow-On is the most basic, affordable and practical upgrade a gun enthusiast can ever find.
Straight out of the box, any firearm with basic gun sights is ready to take the Glow-On upgrade.
Three drops of specifically designed Glow-On is all it takes.
If you remove those sights to replace them with something else, you have already added utility value to them if you need to retrofit them.
It happens all the time.
I can't count the number of time I had to revert to basic gun sights for lack of batteries or because a gas vial is broken.
Give it a try, find more info here: