Very pleased with these sights - Ameriglo Complete Pro Operator Series Night Sight Sets For Glocks

The stock night sights on my Glock 19 X had very little space between the front blade and the sight picture in the rear sight. This made fast shooting a challenge. These sights have more space for quicker sight alignment. The sight dots light up perfect in low light and the dark. The sight picture is excellent for a defensive weapon. The stock rear sight came out easily with just a nylon punch and hammer Lubed first with Mil Spec oil. The replacement rear sight was a tighter fit than the stock Glock sight, but the whole replacement took 5 minutes with no need of a sight pusher and no damage. I bought one of the cheap nut drivers for the front sight (Harbor Freight small nut driver set). I had to grind it thinner to fit between the front of the slide and the head of the small bolt. Works perfect for almost no cost. The one and only negative was the slop in the front sight dovetail (the part that fits in the slot of the slide). It allows some side to side movement of the front sight. I used Blue Loc-Tite on the threads of the bolt. Got the little bolt very snug and so far the front sight has no side to side movement. More shooting will tell if this will be a problem; so far it has held.. If you're using these sights for Bullseye target shooting, the space between the front blade on either side of the rear sight might be too large. These are Combat sights and perfect for fast sight accusation. I would expect the sight picture to be a little tighter on a full length slide (Glock 17 vs. 19 X), but should still be perfect for Combat/Defensive shooting