What gauge nailer do I need for trim and baseboards?

The trade consensus is straightforward: 18-gauge brad nailers handle most interior trim, shoe molding, and light cabinetry; 15- or 16-gauge finish nailers are preferred for door casings, baseboards, and crown because the thicker nail holds better; and 23-gauge pin nailers are for delicate moldings and glue-ups where you don't want a visible hole.