Tru Glo Brite Site Fiber Optic Handgun Sight S&W M&P The TRUGLO BRITE-SITE Fiber-Optic Sight utilizes fiber-optics for the brightest aiming points for fast target acquisition even in low light conditions. The ultimate handgun sight, it features unbelievable transition through all light conditions. Concealed fiber cannot be seen by target. Fits standard holsters. Features: Uses traditional fiber optic technology CNC-machined steel construction Contrasting red front and green rear Concealed fiber cannot be seen by target Fits standard holsters Snag-resistant design.