A circular stapling surgical instrument, comprising: (a) an anvil defining an annular array of staple forming pockets; (b) a closure assembly comprising a trocar configured to selectively couple with the anvil and actuate the anvil between a distal position and a proximal position; (c) a firing assembly comprising: (i) a staple driver, and (ii) an annular array of staples, wherein the staple driver is operable to actuate between an unfired position and a fired position to drive the annular array of staples against the annular array of staple forming pockets when the anvil is in the proximal position; and (d) a casing assembly slidably housing at least a portion of the closure assembly and the firing assembly, wherein the casing assembly comprises: (i) a first section comprising: first handle portion, and a first shaft portion extending distally from the handle portion, (ii) a second section comprising: a second handle portion laterally coupled with the first handle portion, and a second shaft portion extending distally from the second handle portion, wherein the second shaft portion is laterally coupled with the first shaft portion, wherein the second section defines a homogenous continuum of material along the length of the second handle portion and the second shaft portion, characterised in that: the first section comprises: a tubular casing extending distally from the shaft portion, wherein the tubular casing slidably houses the staple driver, wherein the first section defines a homogenous continuum of material along the length of the first handle portion, the first shaft portion, and the tubular casing. (a) an anvil defining an annular array of staple forming pockets; (b) a closure assembly comprising a trocar configured to selectively couple with the anvil and actuate the anvil between a distal position and a proximal position; (c) a firing assembly comprising: (i) a staple driver, and (ii) an annular array of staples, wherein the staple driver is operable to actuate between an unfired position and a fired position to drive the annular array of staples against the annular array of staple forming pockets when the anvil is in the proximal position; and (i) a staple driver, and (ii) an annular array of staples, wherein the staple driver is operable to actuate between an unfired position and a fired position to drive the annular array of staples against the annular array of staple forming pockets when the anvil is in the proximal position; and (d) a casing assembly slidably housing at least a portion of the closure assembly and the firing assembly, wherein the casing assembly comprises: (i) a first section comprising: first handle portion, and a first shaft portion extending distally from the handle portion, (ii) a second section comprising: a second handle portion laterally coupled with the first handle portion, and a second shaft portion extending distally from the second handle portion, wherein the second shaft portion is laterally coupled with the first shaft portion, wherein the second section defines a homogenous continuum of material along the length of the second handle portion and the second shaft portion, characterised in that: the first section comprises: a tubular casing extending distally from the shaft portion, wherein the tubular casing slidably houses the staple driver, wherein the first section defines a homogenous continuum of material along the length of the first handle portion, the first shaft portion, and the tubular casing. (i) a first section comprising: first handle portion, and a first shaft portion extending distally from the handle portion, first handle portion, and a first shaft portion extending distally from the handle portion, (ii) a second section comprising: a second handle portion laterally coupled with the first handle portion, and a second shaft portion extending distally from the second handle portion, wherein the second shaft portion is laterally coupled with the first shaft portion, wherein the second section defines a homogenous continuum of material along the length of the second handle portion and the second shaft portion, characterised in that: the first section comprises: a tubular casing extending distally from the shaft portion, wherein the tubular casing slidably houses the staple driver, wherein the first section defines a homogenous continuum of material along the length of the first handle portion, the first shaft portion, and the tubular casing. a second handle portion laterally coupled with the first handle portion, and a second shaft portion extending distally from the second handle portion, wherein the second shaft portion is laterally coupled with the first shaft portion, wherein the second section defines a homogenous continuum of material along the length of the second handle portion and the second shaft portion, characterised in that: the first section comprises: a tubular casing extending distally from the shaft portion, wherein the tubular casing slidably houses the staple driver, wherein the first section defines a homogenous continuum of material along the length of the first handle portion, the first shaft portion, and the tubular casing.