Rear gunsight in combination with a front gunsight both mounted to a gun

A rear gunsight in combination with a front gunsight both mounted to a gun, wherein when a sight longitudinal axis and a straight sight line extending from a viewpoint are in an optimal orientation relative to each other, said sight longitudinal axis is coextensive with said straight sight line, said straight sight line from said viewpoint is optimally aligned with both said rear and front gunsight, and said straight sight line is in side by side parallel relation to a longitudinal axis of a gun barrel of said gun, said rear gunsight comprising:

• an elongate light collector with an end facing surface, an end, and a coiled portion, said coiled portion between said end and said end facing surface;
• an elongate nontransparent light blocking tube having an interior surface delimiting a hollow, said tube having a first end portion, said first end portion having a first end surface delimiting a first access into said hollow, said tube further having a second end portion opposite the first end portion, said second end portion having a second end surface delimiting a second access into said hollow;
• said tube having a longitudinal axis;
• a lens having a first convex facing surface, said lens overlaps said hollow and connects to said tube;
• a base connected to said tube;
• a housing connected to said base;
• wherein
• said end facing surface of said light collector faces into said hollow and is fixed in place relative to said tube;
• a portion of said hollow between said lens and said end facing surface;
• said coiled portion of said light collector resides in said housing;
• said sight longitudinal axis extends through the first access which opens into the hollow delimited by the internal surface of said tube, a center point of the lens convex surface, the hollow between the lens and said end facing surface, and a center point of said end facing surface;
• and wherein,
• said rear sight adjustable by a user moving the gun to orient said sight longitudinal axis to said optimal orientation relative to said straight sight line from said viewpoint from a non-optimal orientation and from an intermediate orientation,
• said rear sight adjustable by a user moving the gun to orient said sight longitudinal axis to said intermediate orientation relative to said straight sight line from said viewpoint from said non-optimal orientation;
• when said sight longitudinal axis resides in said optimal orientation, a bright shining reference point appears in a view of the user from said viewpoint, said view along said straight sight line from said viewpoint, said reference point appears to encompass and fill a cross sectional area of the tube, said cross sectional for by a cross section area taken perpendicular to the tubes longitudinal axis;
• the interior surface of the tube forming a circumferential boundary of the cross sectional area;
• when said rear sight resides in said intermediate orientation, the bright reference point resides partially in said view of the user when the view is along said straight sight line;
• and
• when said rear sight resides in said non-optimal orientation the bright reference point resides outside of said view of the user when the view is along the straight sight line.