Wyhaq reviews reviews and installs the 5KU aluminum iron sights for the Shadow 2 airsoft pistol. The primary advantage of this upgrade is the significant weight reduction; the aluminum sights weigh only 7 grams compared to the 16-gram stock set. This weight loss is especially beneficial for those using green gas, as a lighter slide improves the gun's cycling efficiency and overall performance.

The installation process involves preparing the fiber optics, where he chooses a custom orange fiber and melts the ends with a lighter to secure it. The front sight fits perfectly without needing filing, though a small amount of super glue is used to secure the retaining pin. The rear sight is noted for its exceptionally tight fit, which the creator prefers over looser, more expensive slides that require shimming.

Overall, Wyhaq is impressed with the high-quality machining and durability of the aluminum sights. Despite having to use significant force to tap the rear sight into place, the components showed no signs of damage. He says that these sights are a worthwhile upgrade for Shadow 2 owners looking for better efficiency and a sharper, more refined appearance for their firearm.