The TruGlo TG131S2 Brite Site Fiber Optic Sight Set is compatible with Sig #6 Front / #8 Rear Gun. It uses traditional fiber optic technology and features CNC machined steel construction. Its red front and green rear are contrasting. This fiber optic sight fits standard holsters and concealed fiber cannot be seen by target. The TruGlo TG131S2 has a snag resistant design.