Great product. - Trijicon Bright & Tough Night Sights for Colt AR-15/ M16

This is a very well-made item that is a drop-in replacement for the OEM flip-up sight. It is an easy install that takes about 5 minutes using a pin punch and flat-headed screwdriver. After drifting the pin part way, be careful to not lose the small ball bearing and spring that make up the sight's detent system. Using a small amount of grease will help position these items upon reinstalling the components. I tested the sight in a dark room and was quite pleased with the result. I recommend this item as a low-light upgrade for the A2 AR-15/16 sight.