I just learned that Glock actually makes night sights. Previously I just thought that you had to go aftermarket, such as Trijicon, if you wanted to put night sights on your Glock. Glock's night sights also seem to be less expensive. Has anyone reading this thread had any experience with Glock's night sights? If so, would you recommend them or would you suggest going with Trijicon? Also, I see that they have them available in 6.5mm or 6.9mm... I have no idea what the difference would be performance-wise here. Anyone know?