A reflex sight includes an elongated sight housing having an outer tube and an inner tube defining a light channel with an optical axis, wherein the inner tube is pivotally secured within an end of the outer tube and has an end section forming an outer perimeter section, which is provided with separate convex sections. The separate convex sections of the inner tube are arranged to fit into the separate concave support sections in the outer tube, wherein the end section of the inner tube is pivotally received within the end section of the outer tube.