A coaxial connector system comprising: an adapter having a first mating portion, a second mating portion and a transition portion, a continuous outer conductive wall (26, 28, 36) extending across the first mating portion, the transition portion and the second mating portion; a first terminal positioned in the adapter; at least one receptacle (14a, 14b) having a receptacle mating section and a receptacle transition section, a continuous receptacle outer conductive wall extending across the receptacle mating section and the receptacle transition section, a receptacle inner wall extending perpendicular to the receptacle outer wall; a second terminal positioned in the at least one receptacle (14a, 14b); a retention member provided in the receptacle mating section, the retention member being an inner spring having a base section and a securing section, the base section being provided about a circumference of the inner spring, the base section having a positioning shoulder and an angled surface, wherein the securing section has resilient contact arms which extend from the base section in a direction away from the angled surface, the contact arms being spaced apart by slots, and an adapter receiving opening extending through the base section and the securing section of the inner spring; wherein the continuous outer conductive wall (26, 28, 36) and the continuous receptacle outer conductive wall form a grounding shield minimizing signal leakage from the first terminal and the second terminal, characterized in that the contact arms are conductive and provide an electrical pathway between the continuous outer conductive wall (26, 28, 36) and the continuous receptacle outer conductive wall; the adapter receiving opening of the inner spring has a diameter at the base section which is slightly larger, but approximately equal to the outside diameter of either the first mating portion or the second mating portion of the adapter; and the adapter receiving opening of the inner spring has a diameter at free ends of the contact arms of the securing section which is smaller than the outside diameter of either the first mating portion or the second mating portion of the adapter. an adapter having a first mating portion, a second mating portion and a transition portion, a continuous outer conductive wall (26, 28, 36) extending across the first mating portion, the transition portion and the second mating portion; a first terminal positioned in the adapter; at least one receptacle (14a, 14b) having a receptacle mating section and a receptacle transition section, a continuous receptacle outer conductive wall extending across the receptacle mating section and the receptacle transition section, a receptacle inner wall extending perpendicular to the receptacle outer wall; a second terminal positioned in the at least one receptacle (14a, 14b); a retention member provided in the receptacle mating section, the retention member being an inner spring having a base section and a securing section, the base section being provided about a circumference of the inner spring, the base section having a positioning shoulder and an angled surface, wherein the securing section has resilient contact arms which extend from the base section in a direction away from the angled surface, the contact arms being spaced apart by slots, and an adapter receiving opening extending through the base section and the securing section of the inner spring; wherein the continuous outer conductive wall (26, 28, 36) and the continuous receptacle outer conductive wall form a grounding shield minimizing signal leakage from the first terminal and the second terminal, characterized in that the contact arms are conductive and provide an electrical pathway between the continuous outer conductive wall (26, 28, 36) and the continuous receptacle outer conductive wall; the adapter receiving opening of the inner spring has a diameter at the base section which is slightly larger, but approximately equal to the outside diameter of either the first mating portion or the second mating portion of the adapter; and the adapter receiving opening of the inner spring has a diameter at free ends of the contact arms of the securing section which is smaller than the outside diameter of either the first mating portion or the second mating portion of the adapter.