Surgical stapling instrument having a two-position lockout mechanism

A surgical stapler comprising:

• an elongate shaft having a proximal end, a distal end, and a longitudinal axis extending between the proximal end and the distal end;
• a firing beam having a proximal end and a distal end, at least a portion of the firing beam being longitudinally slidable within the elongate shaft;
• a jaw assembly at the distal end of the elongate shaft, the jaw assembly comprising:
• a first jaw defining an anvil;
• a second jaw defining a reload support configured to receive a reload cartridge;
• and
• a lockout mechanism engageable with the firing beam;
• and
• a reload cartridge having a plurality of staples deployable therefrom, the reload cartridge removably positionable in the reload support, and the reload cartridge comprising:
• a cartridge body;
• a first lockout actuator positioned on the cartridge body and stationary with respect to the cartridge body to engage the lockout mechanism when the reload cartridge is positioned in the reload support;
• and
• a second lockout actuator positioned within the cartridge body and longitudinally slidable with respect to the cartridge body to engage the lockout mechanism when the reload cartridge is positioned in the reload support and the plurality of staples remain undeployed.