A rear tactical sight for a handgun having a barrel with a barrel axis. The sight including a base extending in a longitudinal direction parallel to the barrel axis. The base having a front and an oppositely facing back with sides extending in the longitudinal direction between the front, the back and a bottom. The sight further including an upwardly opened notch joined to the base and spaced above the base bottom which at least partially defines boundaries of a sight line for the sight and a pair of side walls spaced on either side of the sight line each having outer surfaces that are opposite to one another and which extend upwardly from the base sides. The outer surfaces being substantially symmetrical to one another and each including a first arcuate surface extending upwardly and inwardly from a corresponding one of the base sides respectively and a second arcuate surface extending inwardly and upwardly from the first surface.