I have a set of Tru-Glo fibre optic sights on a Glock 27. They are very good for enabling you to pick up and follow the front sight while shooting. The tru-Glo sights have the Yellow rear and green front. They work okay at night or in darker settings. They are not quite as bright as I thought they would be, but they make it much easier to pick up and follow the front sight. The front sight is a little to wide, in my opinion, so I have just bought a set of Dawson sights for my XDM, but haven't gotten them installed yet.
