One of the best handgun sights on the market today the Truglo Tritium/Fiber Brite Site Handgun Sight - Novak 1911 .270/.500 Front/Rear Green is made tough from CNC-machined steel. Fiber optics technology combined with Tritium allow this sight to transition perfectly in all light conditions. It is made to be snag-free so it will fit most all standard handgun holsters. It requires no batteries and is one of the few sights today that allows you to perfectly frame a target without the target being able to see your sight. Fits Novak LoMount cut .270 Front / .500 Rear (1911 3? Officers & 4.25? Commander 9mm / .40S&W). Novak LoMount cut replacement sights are designed for 1911-style handguns with existing fixed Novak LoMount dovetail cut slides however some fitting may be required. Installation by a competent gunsmith is recommended.