A surgical stapler comprising: (a) a first elongate member having a distal portion that supports an anvil surface, wherein the anvil surface includes a plurality of staple forming pockets; (b) a second elongate member having a distal portion configured to receive a staple cartridge; (c) a clamp member operable to releasably clamp the first elongate member against the second elongate member; and (d) a firing assembly, wherein the firing assembly is translatable from a first longitudinal position to a second longitudinal position to fire the staple cartridge when the first elongate member is clamped against the second elongate member, wherein the firing assembly comprises: (i) a slider that comprises: an inner engagement feature (248, 264, 275), and an outer engagement feature (249, 265, 277), and (ii) an actuator configured to be selectively actuated by a user, wherein the actuator comprises: an inner engagement feature configured to engage with the inner engagement feature of the slider at a first interface when the actuator moves relative to the slider, and an outer engagement feature configured to engage the outer engagement feature of the slider at a second interface when the actuator moves relative to the slider, wherein the second interface is spaced from the first interface, wherein the outer engagement feature of the actuator includes a first outer projection, characterised in that the outer engagement feature of the slider includes a first outer recess (251, 290), wherein the first outer projection is configured to slide along the first outer recess when the actuator moves between a first lateral side of the slider and a second lateral side of the slider. (a) a first elongate member having a distal portion that supports an anvil surface, wherein the anvil surface includes a plurality of staple forming pockets; (b) a second elongate member having a distal portion configured to receive a staple cartridge; (c) a clamp member operable to releasably clamp the first elongate member against the second elongate member; and (d) a firing assembly, wherein the firing assembly is translatable from a first longitudinal position to a second longitudinal position to fire the staple cartridge when the first elongate member is clamped against the second elongate member, wherein the firing assembly comprises: (i) a slider that comprises: an inner engagement feature (248, 264, 275), and an outer engagement feature (249, 265, 277), and (ii) an actuator configured to be selectively actuated by a user, wherein the actuator comprises: an inner engagement feature configured to engage with the inner engagement feature of the slider at a first interface when the actuator moves relative to the slider, and an outer engagement feature configured to engage the outer engagement feature of the slider at a second interface when the actuator moves relative to the slider, wherein the second interface is spaced from the first interface, wherein the outer engagement feature of the actuator includes a first outer projection, characterised in that the outer engagement feature of the slider includes a first outer recess (251, 290), wherein the first outer projection is configured to slide along the first outer recess when the actuator moves between a first lateral side of the slider and a second lateral side of the slider. (i) a slider that comprises: an inner engagement feature (248, 264, 275), and an outer engagement feature (249, 265, 277), and an inner engagement feature (248, 264, 275), and an outer engagement feature (249, 265, 277), and (ii) an actuator configured to be selectively actuated by a user, wherein the actuator comprises: an inner engagement feature configured to engage with the inner engagement feature of the slider at a first interface when the actuator moves relative to the slider, and an outer engagement feature configured to engage the outer engagement feature of the slider at a second interface when the actuator moves relative to the slider, wherein the second interface is spaced from the first interface, wherein the outer engagement feature of the actuator includes a first outer projection, an inner engagement feature configured to engage with the inner engagement feature of the slider at a first interface when the actuator moves relative to the slider, and an outer engagement feature configured to engage the outer engagement feature of the slider at a second interface when the actuator moves relative to the slider, wherein the second interface is spaced from the first interface, wherein the outer engagement feature of the actuator includes a first outer projection,