The present invention relates to a replaceable reload for a surgical stapling apparatus. The replaceable reload comprising a tool assembly, a proximal body portion, and an intermediate mounting assembly. The tool assembly being pivotable with respect to the proximal body portion. The tool assembly including an anvil assembly and a removable and replaceable cartridge assembly. The anvil assembly and cartridge assembly being movable in relation to one another. The cartridge assembly having a support plate, cartridge body, a plurality of staples, and a staple firing assembly including a sled. The sled having cam surfaces and a proximally extending member. The replaceable reload further including a drive member movable through the cartridge assembly and the anvil assembly. The replaceable reload also including a latch member pivotably support for movement from an initial position to an unlocked position with respect to the drive member, the sled being arranged so that upon movement of the sled the proximally extending member engages the latch member and pivots the latch member to the unlocked position.
