Meprolight's Tru-DotA(R) Tritium Night Sights for the Armscor / Rock Island Tac 1911 FS really "shine" when sights are useless. Both front and rear sights have their own Tritium gas light source - no switch to turn on, no batteries to wear out - that gives you a distinctive green/green, 3-dot sight picture that you can see even in very low light. With Meprolight Tru-Dot A(R) Tritium Night Sights installed on your Armscor / Rock Island Tac 1911 FS, you get up to 20% more brightness compared to other-brand Tritium sights. As an extra benefit, the front dot is glows brighter than the rear dots to help ensure you get the dots correctly aligned. Fits curr Mfg: Meprolight