The family of FT Tritium sights are fiber optic and tritium-enhanced sights to improve target acquisition in both day and night shooting situations. The MEPROLIGHT FT Family includes tritium on top of fiber optics for extremely bright aiming point day and night. Rear sights can be used with your existing front sight and are available in either orange or green. Features: - No Front Sight Needed - Easy Target acquisition - Low Profile Design Specifications: - Fits: S&W M&P Shield - Fiber Tritium Bullseye - Rear Sight: Green.