An injector comprising: a syringe arranged along a longitudinal axis and having a needle fixedly mounted therein; a removable cover for removable engagement with said syringe, said removable cover comprising a removable needle cover covering said needle; and a cover removal assembly comprising: an outer portion which is engagable by a user and is movable axially in a cover disengagement direction along an axial travel path with respect to said longitudinal axis; and an inner portion which includes at least one engagement portion which is engagable with said removable needle cover, whereby axial movement of said inner portion in said cover disengagement direction removes said removable needle cover from said syringe, characterized in that: at least one of said outer portion and said inner portion being configured such as to provide an axially floating lost motion engagement between said outer portion and said inner portion, whereby axial movement of said outer portion in said cover disengagement direction produces corresponding axial movement of said inner portion in said cover disengagement direction along at least a portion of said axial travel path, the length of said portion of said axial travel path being a function of the relative axial positioning of said removable needle cover and said syringe; and said axially floating lost motion engagement provides an axial slidable engagement between said outer portion and said inner portion for accommodating manufacturing tolerances and variations in the relative axial positioning of multiple parts of said injector. a syringe arranged along a longitudinal axis and having a needle fixedly mounted therein; a removable cover for removable engagement with said syringe, said removable cover comprising a removable needle cover covering said needle; and a cover removal assembly comprising: an outer portion which is engagable by a user and is movable axially in a cover disengagement direction along an axial travel path with respect to said longitudinal axis; and an inner portion which includes at least one engagement portion which is engagable with said removable needle cover, whereby axial movement of said inner portion in said cover disengagement direction removes said removable needle cover from said syringe, an outer portion which is engagable by a user and is movable axially in a cover disengagement direction along an axial travel path with respect to said longitudinal axis; and an inner portion which includes at least one engagement portion which is engagable with said removable needle cover, whereby axial movement of said inner portion in said cover disengagement direction removes said removable needle cover from said syringe, at least one of said outer portion and said inner portion being configured such as to provide an axially floating lost motion engagement between said outer portion and said inner portion, whereby axial movement of said outer portion in said cover disengagement direction produces corresponding axial movement of said inner portion in said cover disengagement direction along at least a portion of said axial travel path, the length of said portion of said axial travel path being a function of the relative axial positioning of said removable needle cover and said syringe; and said axially floating lost motion engagement provides an axial slidable engagement between said outer portion and said inner portion for accommodating manufacturing tolerances and variations in the relative axial positioning of multiple parts of said injector.