A dental implant system for placement within a jaw of a patient includes an envelope including an outer surface and an inner surface defining a barrel. At least one barrier is located in the barrel. The barrel having a first region on one side of the barrier and a second region on an opposing side of the barrier. An expander member is movable within the barrel along a longitudinal axis of the barrel from the first region to the second region. The barrier prohibits the expander member from moving from the second region to the first region.
