I bought my first Glock that came with nightsights and I wish I had'nt. I always put them on myself before. I use ameriglo, meprolight and trijicon on my other Glocks. First, these feel plastic. Second, they are not very bright and the front sights bulb does'nt look centered in the housing. I field stripped it to see how it was held on and it's staked! They charged me $30 more than Glocks without the nightsights. I should have saved my $30 and ordered another set of ameriglos. Save yourself the trouble and don't buy your Glocks with the crappy factory nightsights. I'll update this thread when my front sight falls off.