An apparatus for application of surgical clips to body tissue, the apparatus comprising: an elongate endoscopic shaft assembly supported by and extending distally from a handle assembly and defining a longitudinal axis; the handle assembly including a trigger and a drive bar reciprocally translatable by the trigger upon an actuation thereof, wherein the shaft assembly extends distally from the handle assembly; the shaft assembly including: a housing; a jaw mounted adjacent a distal end portion of the housing, the jaw being movable between an open spaced-apart condition and a closed approximated condition; a clip carrier disposed in the shaft assembly and defining a clip channel, the clip carrier including windows; a plurality of surgical clips slidably disposed within the clip channel of the clip carrier; a pusher bar reciprocally disposed within the housing of the shaft assembly, the pusher bar being configured to load a distal-most surgical clip, of the plurality of surgical clips, into the jaw during each distal advancement of the pusher bar, the pusher bar including a proximally extending catch; a clip follower slidably disposed within the clip channel of the clip carrier and disposed proximally of the plurality of surgical clips for urging the plurality of surgical clips in a distal direction, the clip follower including proximal tab and a lock-out plate, the lock-out plate including a resilient tail extending from a surface thereof and defining a window, wherein, following a firing of a final surgical clip, the window of the resilient tail receives the catch of the pusher bar, and the proximal tab engages in distal window of windows of the clip carrier, thereby preventing movement of the pusher bar in a proximal direction. an elongate endoscopic shaft assembly supported by and extending distally from a handle assembly and defining a longitudinal axis; the handle assembly including a trigger and a drive bar reciprocally translatable by the trigger upon an actuation thereof, wherein the shaft assembly extends distally from the handle assembly; the shaft assembly including: a housing; a jaw mounted adjacent a distal end portion of the housing, the jaw being movable between an open spaced-apart condition and a closed approximated condition; a clip carrier disposed in the shaft assembly and defining a clip channel, the clip carrier including windows; a plurality of surgical clips slidably disposed within the clip channel of the clip carrier; a pusher bar reciprocally disposed within the housing of the shaft assembly, the pusher bar being configured to load a distal-most surgical clip, of the plurality of surgical clips, into the jaw during each distal advancement of the pusher bar, the pusher bar including a proximally extending catch; a clip follower slidably disposed within the clip channel of the clip carrier and disposed proximally of the plurality of surgical clips for urging the plurality of surgical clips in a distal direction, the clip follower including proximal tab and a lock-out plate, the lock-out plate including a resilient tail extending from a surface thereof and defining a window, wherein, following a firing of a final surgical clip, the window of the resilient tail receives the catch of the pusher bar, and the proximal tab engages in distal window of windows of the clip carrier, thereby preventing movement of the pusher bar in a proximal direction. a housing; a jaw mounted adjacent a distal end portion of the housing, the jaw being movable between an open spaced-apart condition and a closed approximated condition; a clip carrier disposed in the shaft assembly and defining a clip channel, the clip carrier including windows; a plurality of surgical clips slidably disposed within the clip channel of the clip carrier; a pusher bar reciprocally disposed within the housing of the shaft assembly, the pusher bar being configured to load a distal-most surgical clip, of the plurality of surgical clips, into the jaw during each distal advancement of the pusher bar, the pusher bar including a proximally extending catch; a clip follower slidably disposed within the clip channel of the clip carrier and disposed proximally of the plurality of surgical clips for urging the plurality of surgical clips in a distal direction, the clip follower including proximal tab and a lock-out plate, the lock-out plate including a resilient tail extending from a surface thereof and defining a window, wherein, following a firing of a final surgical clip, the window of the resilient tail receives the catch of the pusher bar, and the proximal tab engages in distal window of windows of the clip carrier, thereby preventing movement of the pusher bar in a proximal direction.