This is a Hi-Viz Sight known as the Mini-Comp, model PM2011.
HIVIZ(R) MiniComp Interchangeable Shotgun Sight. Screw-Attach design replaces the front bead on a shotgun. Fits most vent-ribbed shotguns with removable front bead. Includes Green" Red and Orange replaceable LitePipes.
Features:
Fits most vent-ribbed shotguns with removable front bead
Red green and orange LitePipes;.100 diameter
