Good upgrade to standard front sight post - Blitzkrieg Components AR-15 Flat Front Sight Post

This front sight post is easy to install, especially with the included tool. The yellow/green stripe is easy to acquire, and the fact that it glows when you hit it with a flashlight is a really cool feature. Would definitely recommend if you're an iron sight shooter. The downside of the paint only being on one side is that you lose some elevation granularity when zeroing the rifle (in that only 1 out of every 4 clicks has the yellow/green stripe facing you) but unless you're wanting to do precision shooting this isn't going to matter in practice.