Direct replacements for factory sights on popular handguns gather ambient light for superb visibility. The more light, the brighter the rods glow. 3-dot sight picture; front sight has red insert, rear has two green inserts. If the gun was originally equipped with an adjustable rear sight, the Fire Sight will be adjustable. Fits Buckmark handgun with rear sight length over 1" Mfg: Williams Gun Sight