A surgical instrument, comprising: a surgical end effector, comprising: a first jaw; and a second jaw movably supported relative to said first jaw for selective movement between open and closed positions relative to said first jaw, wherein said second jaw comprises a mounting portion pivotally fixed to said first jaw for selective pivotal travel relative thereto, and wherein said surgical instrument further comprises: a hollow closure member configured to axially move between an unactuated position and closure positions wherein said hollow closure member is configured to apply closure motions to said movable second jaw; a closure system configured to apply closure actuation motions to said hollow closure member; a firing member supported for axial travel between a starting position and an ending position, wherein said firing member comprises a first firing member cam configured to engage the first jaw and a second firing member cam configured to engage the second jaw; and a firing system configured to selectively apply a firing motion to said firing member to cause said firing member to move from said starting position to said ending position and wherein said closure system is actuatable without actuating said firing system, characterized in that said firing member is located completely within said hollow closure member when in its starting position and within said surgical end effector when in its ending position. a surgical end effector, comprising: a first jaw; and a second jaw movably supported relative to said first jaw for selective movement between open and closed positions relative to said first jaw, wherein said second jaw comprises a mounting portion pivotally fixed to said first jaw for selective pivotal travel relative thereto, and a first jaw; and a second jaw movably supported relative to said first jaw for selective movement between open and closed positions relative to said first jaw, wherein said second jaw comprises a mounting portion pivotally fixed to said first jaw for selective pivotal travel relative thereto, and wherein said surgical instrument further comprises: a hollow closure member configured to axially move between an unactuated position and closure positions wherein said hollow closure member is configured to apply closure motions to said movable second jaw; a closure system configured to apply closure actuation motions to said hollow closure member; a firing member supported for axial travel between a starting position and an ending position, wherein said firing member comprises a first firing member cam configured to engage the first jaw and a second firing member cam configured to engage the second jaw; and a firing system configured to selectively apply a firing motion to said firing member to cause said firing member to move from said starting position to said ending position and wherein said closure system is actuatable without actuating said firing system, characterized in that said firing member is located completely within said hollow closure member when in its starting position and within said surgical end effector when in its ending position. a hollow closure member configured to axially move between an unactuated position and closure positions wherein said hollow closure member is configured to apply closure motions to said movable second jaw; a closure system configured to apply closure actuation motions to said hollow closure member; a firing member supported for axial travel between a starting position and an ending position, wherein said firing member comprises a first firing member cam configured to engage the first jaw and a second firing member cam configured to engage the second jaw; and a firing system configured to selectively apply a firing motion to said firing member to cause said firing member to move from said starting position to said ending position and wherein said closure system is actuatable without actuating said firing system, characterized in that said firing member is located completely within said hollow closure member when in its starting position and within said surgical end effector when in its ending position.