The Dead Air R-Series Front Cap Tool is designed to work with Wolfman, Sierra 5, Sandman Series, Nomad Series, Wolverine, Primal and Pyro suppressors. There are two different versions of the front end cap, depending on the pin size. Notes:Dead Air R-Series MK1 Front Cap Tool (small pin legacy front cap)Dead Air R-Series MK2 Front Cap Tool (large pin current front cap)