A shaft assembly for an apparatus for applying surgical clips to body tissue, the shaft assembly comprising: a pair of jaws movable between a spaced-apart position and an approximated position; an elongated spindle having a proximal portion configured to be coupled to an actuator and defining a distally-oriented wall, and a distal portion operably coupled to the pair of jaws to selectively approximate the pair of jaws during distal advancement of the spindle; a trip block reciprocally supported on the proximal portion of the spindle and axially movable both with and relative to the spindle, the trip block defining a proximally-oriented wall; a biasing member having a proximal portion and a distal portion, the biasing member extending between the proximal portion of the spindle and the trip block, wherein the proximal portion of the biasing member is coupled to the distally-oriented wall of the spindle and the distal portion of the biasing member is coupled to the proximally-oriented wall of the trip block; and a pusher bar having a proximal portion coupled to the trip block, and a distal portion configured to load a distal-most surgical clip ("DC") into the pair of jaws during distal movement of the trip block, via distal movement of the spindle, and remain in a distally advanced position during approximation of the pair of jaws, characterized in that: the proximal portion of the pusher bar is fixedly coupled to the trip block; the proximal portion of the spindle defines an elongate channel extending longitudinally along the spindle; the trip block defines an elongate channel in communication with the elongate channel of the spindle, whereby the elongate channels of the spindle and the trip block, respectively, together form a unitary channel; and the biasing member is disposed within and extends through the unitary channel. a pair of jaws movable between a spaced-apart position and an approximated position; an elongated spindle having a proximal portion configured to be coupled to an actuator and defining a distally-oriented wall, and a distal portion operably coupled to the pair of jaws to selectively approximate the pair of jaws during distal advancement of the spindle; a trip block reciprocally supported on the proximal portion of the spindle and axially movable both with and relative to the spindle, the trip block defining a proximally-oriented wall; a biasing member having a proximal portion and a distal portion, the biasing member extending between the proximal portion of the spindle and the trip block, wherein the proximal portion of the biasing member is coupled to the distally-oriented wall of the spindle and the distal portion of the biasing member is coupled to the proximally-oriented wall of the trip block; and a pusher bar having a proximal portion coupled to the trip block, and a distal portion configured to load a distal-most surgical clip ("DC") into the pair of jaws during distal movement of the trip block, via distal movement of the spindle, and remain in a distally advanced position during approximation of the pair of jaws, the proximal portion of the pusher bar is fixedly coupled to the trip block; the proximal portion of the spindle defines an elongate channel extending longitudinally along the spindle; the trip block defines an elongate channel in communication with the elongate channel of the spindle, whereby the elongate channels of the spindle and the trip block, respectively, together form a unitary channel; and the biasing member is disposed within and extends through the unitary channel.