Tru-dot sights offers a sighting system for improved rapid instinctive aiming which requires no transition from day to night use.Day and night, the shooter's aiming reference are three solid dots, identical in appearance and location under all light conditions.This model has 5-40 bead threads and is compatible with mossberg shotguns.Type: FrontFrame Color: BlackFirearm Fit: Mossberg 500Style: Fixed FrontFront Material: TritiumFront Color: GreenWindage Adjustment: NoElevation Adjustment: NoFirearm Type: Shotgun