Truglo's Tru-Bead Universal sight features an extremely low profile and is CNC-machined. It is compatible with any firearm barrel rib width and includes interchangeable fibers.
Specifications:

Type	Fiber Optic Bead
Frame Material	Steel
Frame Color	Black
Firearm Fit	Shotgun
Base Configuration	Vent Rib
Style
Front Material	Fiber Optic
Rear Material
Front Color	Green/Red/Yellow/Orange
Rear Color	Green
Rail Size
Windage Adjustment
Elevation Adjustment
Fiber Diameter
Firearm Type	Shotgun