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 relative thereto between an open position and closed positions, wherein said surgical instrument further comprises a closure member axially movable in response to closing and opening motions applied thereto, characterized in that : said closure member comprises at least one opening cam removably attached to said closure member and being configured for snap engagement therewith, and the at least one opening cam protrudes from said closure member to movably engage a corresponding slotted cam surface on said second jaw such that upon application of said opening motion to said closure member: said at least one opening cam is configured to movably engage said corresponding slotted cam surface to move said second jaw to said open position and upon application of said closure motion to said closure member, and said closure member is configured to engage said second jaw to move said second jaw to one of said closed positions. a surgical end effector comprising: a first jaw ; and a second jaw movably supported relative to said first jaw for selective movement relative thereto between an open position and closed positions, a first jaw ; and a second jaw movably supported relative to said first jaw for selective movement relative thereto between an open position and closed positions, wherein said surgical instrument further comprises a closure member axially movable in response to closing and opening motions applied thereto, characterized in that : said closure member comprises at least one opening cam removably attached to said closure member and being configured for snap engagement therewith, and the at least one opening cam protrudes from said closure member to movably engage a corresponding slotted cam surface on said second jaw such that upon application of said opening motion to said closure member: said at least one opening cam is configured to movably engage said corresponding slotted cam surface to move said second jaw to said open position and upon application of said closure motion to said closure member, and said closure member is configured to engage said second jaw to move said second jaw to one of said closed positions. said closure member comprises at least one opening cam removably attached to said closure member and being configured for snap engagement therewith, and the at least one opening cam protrudes from said closure member to movably engage a corresponding slotted cam surface on said second jaw such that upon application of said opening motion to said closure member: said at least one opening cam is configured to movably engage said corresponding slotted cam surface to move said second jaw to said open position and upon application of said closure motion to said closure member, and said closure member is configured to engage said second jaw to move said second jaw to one of said closed positions. said at least one opening cam is configured to movably engage said corresponding slotted cam surface to move said second jaw to said open position and upon application of said closure motion to said closure member, and said closure member is configured to engage said second jaw to move said second jaw to one of said closed positions. <EOS>