this sight is precision milled high tensile strength anodized aluminum. The same type of aluminum used as a message bearing plaque aboard pioneer 10 and 11. Tolerences for machining are within one or two hairs. Understand fiber optic cable is made of glass fiber no bigger than a hair it will break if not handled properly. easy install great quality. everything i asked for and then some.
I inspected the sight after removing it from the package, and I couldn't see how it could be adjusted easily. There are three screws on top, but they don't seem to travel far enough to have any effect on elevation. Of course, there were no instructions. After reading some of the reviews, I was afraid of breaking it, so I am going to return it. I'm a bit dissapointed because I really like TruGlo sights, and am happy with them on two other guns.