A reload assembly includes a shell housing, a knife carrier, a lockout component, and a hook component. The lockout component is supported on an inner wall of the knife carrier and has a body formed of a resilient material that defines a window. The hook component is supported on the inner housing portion of the shell housing and includes a body having a hook that is received within the window of the lockout component when the knife carrier is in its retracted position after the reload assembly has been fired to obstruct readvancement of the knife carrier.