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.
Specifications:

Type	Fiber Optic Bead
Frame Material	Composite
Frame Color	Black
Firearm Fit	12-20 Gauge
Base Configuration	Fiber Composite
Style
Front Material	Fiber Optic
Rear Material
Front Color	Green
Rear Color
Rail Size
Windage Adjustment
Elevation Adjustment
Fiber Diameter
Firearm Type	Shotgun