Psionic adventurers who focus most heavily on ranged weapons. Some Marksmen are drawn to the way of the gun (see the Kaigun archetype), while others from more primitive backgrounds might find the bow or a thrown weapon more to their liking.
In any case, their psionic powers augment their combat and scouting roles, allowing them to do things with ranged weapons no mundane person could. Some might find these tricks spooky, but there’s no doubting their effectiveness. Marksmen are found among most of the races showing psionic ability; the Faetani are seldom dexterous enough to excel at ranged combat.
Kaiguns receive the Basic Firearms Proficiency feat as a bonus feat at first level.