A reload configured for use with a surgical stapling apparatus, the reload comprising: a shaft including a proximal end and distal end, the proximal end adapted to couple to a surgical apparatus; a tool assembly disposed on the distal end of the shaft, the tool assembly including a first jaw member supporting a cartridge assembly having a plurality of fasteners and a plurality of pushers positioned to eject the fasteners from the cartridge assembly and a second jaw member supporting an anvil, the first jaw member being movable in relation to the second jaw member between spaced and approximated positions; a firing cam bar assembly including a first firing cam bar having an elongated configuration defined by left and right side walls (37a, 37b), the cam bar including a cam surface having a first cam portion and a second cam portion, the configuration of the first cam portion of the cam surface facilitating movement of the first jaw towards the second jaw member from a spaced position to an approximated position; and a cantilever provided at a proximal end of the first jaw member, the cantilever supporting a cam member positioned to be slidably engaged by the cam portions of the firing cam bar when the firing cam bar assembly is advanced distally within the cartridge; wherein, in the spaced position, a distal end of the firing cam bar is positioned proximally of the plurality of pushers and the plurality of fasteners and an engagement portion of the first cam portion of the firing cam bar is positioned proximally of the cam member and, when the firing cam bar is advanced distally, the first cam portion of the firing cam bar engages the cam member to pivot the first jaw member including the cartridge towards the anvil of the second jaw member to move the first jaw member including the cartridge to the approximated position, characterised in that the firing cam bar assembly further includes a second or inner firing cam bar, the second firing cam bar being of a similar configuration to the first firing cam bar in that the second firing cam bar also has an elongated configuration defined by left and right sidewalls (45a, 45b) which have a distal end, each of the left and right sidewalls (45a, 45b) comprising a cam surface having a first cam portion and second cam portion, and wherein the second firing cam bar is seated within the first firing cam bar. a shaft including a proximal end and distal end, the proximal end adapted to couple to a surgical apparatus; a tool assembly disposed on the distal end of the shaft, the tool assembly including a first jaw member supporting a cartridge assembly having a plurality of fasteners and a plurality of pushers positioned to eject the fasteners from the cartridge assembly and a second jaw member supporting an anvil, the first jaw member being movable in relation to the second jaw member between spaced and approximated positions; a firing cam bar assembly including a first firing cam bar having an elongated configuration defined by left and right side walls (37a, 37b), the cam bar including a cam surface having a first cam portion and a second cam portion, the configuration of the first cam portion of the cam surface facilitating movement of the first jaw towards the second jaw member from a spaced position to an approximated position; and a cantilever provided at a proximal end of the first jaw member, the cantilever supporting a cam member positioned to be slidably engaged by the cam portions of the firing cam bar when the firing cam bar assembly is advanced distally within the cartridge; wherein, in the spaced position, a distal end of the firing cam bar is positioned proximally of the plurality of pushers and the plurality of fasteners and an engagement portion of the first cam portion of the firing cam bar is positioned proximally of the cam member and, when the firing cam bar is advanced distally, the first cam portion of the firing cam bar engages the cam member to pivot the first jaw member including the cartridge towards the anvil of the second jaw member to move the first jaw member including the cartridge to the approximated position, characterised in that the firing cam bar assembly further includes a second or inner firing cam bar, the second firing cam bar being of a similar configuration to the first firing cam bar in that the second firing cam bar also has an elongated configuration defined by left and right sidewalls (45a, 45b) which have a distal end, each of the left and right sidewalls (45a, 45b) comprising a cam surface having a first cam portion and second cam portion, and wherein the second firing cam bar is seated within the first firing cam bar.