Post, kit and railing system including the same

A post system comprising:

• a structural post extending along a longitudinal axis from a bottom end to a top end, the bottom end of the structural post configured to be mounted to a support structure so that the structural post extends upright from the support structure;
• a plurality of corner covers configured to be coupled to the structural post to form a configurable post assembly in which the plurality of corner covers form longitudinal corner sections of the configurable post assembly and a longitudinal gap exists between adjacent ones of the plurality of the corner covers;
• and
• a plurality of cover plates configured to be coupled to the configurable post assembly to fill in selected ones of the longitudinal gaps so that remaining ones of the longitudinal gaps can be used for coupling railing infills to the configurable post assembly to form any one of a corner post, an end post, or a straight post in a railing system.