This is a AmeriGlo Sight known as the Tall Suppressor, model GL-329.
AmeriGlo suppressor height sets provide an elevated sight picture" able to co-witness with slide-mounted miniature red dot optics and suppressors. For more information on how to choose the correct height set for your suppressor or optic" visit the AmeriGlo website" under the "INFO" tab.
Features:
Green tritium .140 wide with white outline front
Green tritium 2-dot .150 square notch with white outline rear
Fits all Glock models except G42/43
