This is a Hi-Viz Sight known as the Litewave, model GLT178.
HIVIZ(R) Interchangeable Front and Rear Target Sight Set for Glock pistols. Fits all Glock models. Rear is .224" tall" notch is .140" wide x .125" deep; Front is .215" tall x .120" wide. Front sight includes Green" Red and White replaceable LitePipes; rear sight includes Green" Red and Black replaceable LitePipes.
Features:
Interchangeable Litepipe for front and rear sight
Fits all Glock models in 9mm 40 S&W
Does not fit 42/43
Front sight includes green red and white LitePipes;Rear sight includes green red and black LitePipes
