Abstract: A sight module for a firearm having a barrel axis includes a base for detachably attaching onto the firearm, a first optic upwardly extended from the base to define a first sight axis parallel to the barrel axis of the firearm, and a second optic sidewardly extended from the first optic to define a second sight axis parallel to the barrel axis of the firearm and orientated at an offset angle with respect to the first sight axis, wherein a distance between the first sight axis and the barrel axis equals to a distance between the second sight axis and the barrel axis. Therefore, a user is able to maintain the same cheek weld on the firearm stock to view one of the first and second optics in order to quickly switch between the first and second optics by simply rotating the firearm.