This is a Hi-Viz Sight known as the Litewave, model RGPLW01.
HIVIZ(R) LiteWave(R) Front Sight for Ruger "P" Series pistols. Fits all "P" Series pistols; does not fit P-345 models. Also fits SP101 revolvers" except in .327 Fed. Includes Green" Red and White replaceable LitePipes.
Features:
Interchangeable Litepipe front sight
Includes green red and white LitePipes;.090 diameter
