I have this on my gen 4 17 and love it. It's a great combat sight. What I did was just leave the original front sight post in place. I'd say go for it if you want one for quick target acquisition. I used it in a local competition as well where the scenario had hostages and bad guys to shoot at and did great. Basically when your on target with these sights you just get a bright light indication that. You'll get that more once you install and play with them a bit. My only complaint with them is that I wish they had tritium to allow for night use. And I'm visually impaired so the tritium helps me see sights but the fiber optic in these produces a very bright light. Hope this helps.