Designed for plain barrel shotguns, the Glo-Dot II Universal sight simply snaps in place over your existing front bead sight for perfect alignment to provide you with a bright, easy to see aiming dot. This model is not compatible with vent rib barrels. Type Fiber Optic Bead Style Fiber Optic Front Sight Series II Firearm Fit Shotgun Frame Color Black Front Color Red/Fiber Optic Firearm Type Shotgun Frame Material Polymer Front Material Fiber Optic Base Configuration Fiber Composite