So I'm still shopping around as it will be a few months until I buy anything. However, I'm thinking I want a Glock and I want Trijicon night sights. I don't want the Glock brand ones nor do I want the fixed sights. Anyway, I was thinking of using one of the GSSF certificates and I see they list a price for a fixed sight one, one with Glock night sights, and one with the Trijicon night sights. So does this mean it comes straight from Glock with the Trijicons already installed? The local place that accepts the certificate says that they don't stock the one with the night sights installed from the factory, but they can install a set of Trijicons there. It would even out to about the same price as getting them already on there for the price on the GSSF certificate. So would I be better off to get them to order what I want with the Trijicons already installed? Or would there be no disadvantage to just getting the fixed sight one and having them install the Trijicons? The only thing I'm really worried about is since they are fixed sights I don't want them to not be zeroed in and then the pistol not be accurate and me have to pay to have them adjusted. Is this a concern with dealer installed night sights? Or is this something that's not likely to happen?