This is a AmeriGlo Sight known as the UC, model GL-354.
This set was designed for rapid target acquisition" and is composed of a large" highly visible front sight and a black serrated U-notch rear. The simplicity of this combination minimizes distraction and greatly reduces the time between threat identification and threat neutralization" and is the ideal choice for any EDC weapon.
Features:
Green tritium .140 wide with LumiGreen front
Black serrated
.165 wide U-notch rear