A single-mirror target viewing apparatus configured for enabling a gun to be fired at a desired target from a cover position in an aimed manner. The target viewing apparatus comprises a primary mirror assembly, a mounting base and an auxiliary mirror assembly. The primary mirror assembly includes a single utilized mirror that provides a target imaging surface. The mounting base is configured for being attached to a gun and having the primary mirror assembly moveably attached thereto. The single utilized mirror is movable between a stowed position and a deployed position and is rotatable between a plurality of rotational positions when in the deployed position. The auxiliary mirror assembly is removably attached to at least one of the primary mirror assembly and the mounting base. The single utilized mirror of the primary mirror assembly is a first configuration and the auxiliary mirror assembly includes a mirror of a second configuration different than the first configuration. Accordingly, the auxiliary mirror assembly 200 may be installed and utilized in instances where the configuration of the single utilized mirror 26 is undesirable, inadequate and/or insufficient.