This is a Truglo Sight known as the Brite-Site, model TG231X.
When the lights go out" your sidearm doesn't need to be left in the dark. Tritium night sights transition from standard white dot sights during the daylight" to glowing green dots in the dark. Tritium does not need batteries and does not need to be charged with light - it simply glows!
Features:
Traditional tritium night sights
Uses the brightest tritium available
Green front and rear
Fits standard holsters
Snag-resistant design
