This is a AmeriGlo Sight Tool known as the Trooper, model GL-820.
AMERIGLO is committed to manufacturing the highest quality tritium" painted dot" fiber rod" and custom OEM iron sights for the modern hand-gunner. With the largest selection of set options for leading firearm brands" AMERIGLO brings a clear advantage to your shooting experience on and off the range.
Features:
Sight set with green tritium lamp
orange or luminescent green outline front and two green tritium lamp rear for Glocks
Highly visible under all lighting conditions.
LumiGreen paint will glow brightly for 10 minutes after light exposure.