The Progenitor Switch-Body features countersinks for the switch and recharge port and a knurled grip section.  

To connect this Apprentice Switch-Body to an Elite Emitter you will need the elite male to apprentice female adapter found here. 

To connect this Apprentice Switch-Body to an Elite Pommel you will need the apprentice male to elite female adapter found here. 

This Switch-Body is only compatible with the Drop-in cores available here, it is not compatible with legacy electronics.