A situational-awareness accessory comprises a housing including a control board, a user display, and a visual sensor for receiving electromagnetic radiation that is invisible to the human eye from a wide-angle, optical field-of-view in front of the visual sensor. The control board converts the received electromagnetic radiation into visual display data and initiates display of the visual display data on the user display. A quick-detach accessory base mount coupled with the housing permits attachment of the housing to an accessory rail.