Looks great, functions okay. - XS Sight Systems F8 Night Sight

Sights are quality and have a great sight picture. The front sight is bright and draws the eye. Installation is easy, though beware of the rear sight. It secures with screws, like other sights including the Vickers elite battle sights but with the Vickers sights, the screw is a secondary securing measure. The main way most rear sights secure in place is the tight squeeze into the dove tail. These XS sights are loose and ONLY secure by the set screws. After firing two mags the screws loosened and the rear sight almost fell out. Be sure to use loctite, but given the way the screws are built into the rear sight, it isn’t easy. Other than that, they perform decent. I expected more given the price.