A surgical staple cartridge is disclosed. The surgical staple cartridge comprises a cartridge body defining an elongate slot. The surgical staple cartridge further comprises a plurality of staple pushers movably supported in the cartridge body for vertical travel therein. Each staple pusher operably supports at least one staple thereon. The surgical staple cartridge further comprises a plurality of movable drivers operably supported in the cartridge body. Each movable driver corresponds to at least one of the staple pushers and includes a camming surface thereon such that when each movable driver is contacted by an axially moving actuator, at least a portion of each of the movable drivers moves laterally away from the elongate slot to bring the camming surface thereon into camming contact with the staple pusher corresponding thereto to thereby move the corresponding staple pusher vertically within the cartridge body.