I recently got a Glock 17 equipped with trijicon night sights. The sights were supposedly factory installed but I have my doubts because the front sight came loose and fell off after a few hundred rounds of shooting. I had the store where I bought it reinstall the front sight with a bit of lock tight to ensure this didn't happen again. The gun is squared away now and, after another 2000 rounds, I find that it shoots a little bit high. I had an expert marksman check it out and he concurred. I find that I have to line up the front sight about 1mm lower than where it should be to be properly centered with the rear sights. I have 3 questions about this issue:
1) Is there a spacer used with the trijicon front sight that I may have lost when it fell off?
2) Would it be possible to place a small shim under the front sight to lift it that tiny bit it would take to get it dialled in perfectly?
3) If there is no way to modify the trijicon sights can anyone recommend a high quality adjustable night sight?