Beretta Vertec Night Sights were developed for the M9A3 pistol and are also available to upgrade other Vertec version slides. These feature easy-to-see white outlined green Tritium vials in the front and rear. Note: if marked H3 on the metal sight, the product contains tritium gas and is a night sight, regulated by the US Nuclear Regulatory Commission. Sight kit must be fit by a professional gunsmith; improper installation will void warranty coverage.