A reload assembly includes a shell housing (110), a knife carrier (114), and at least one engagement member (180). The shell housing includes an inner housing portion (142) and an outer housing portion (140) that is spaced from the outer housing portion to define an annular cavity (144). The knife carrier defines a longitudinal axis and supports a knife (116). The knife carrier also defines a stepped central bore (172) having a distal portion and a proximal portion and has a shoulder (176) positioned between the distal and proximal portions. The at least one engagement member is supported on the knife carrier and is positioned to engage the inner housing portion of the shell housing when the knife carrier is in its retracted position to retain the knife carrier in the retracted position.
