The Adapter will allow you convert any light with the Surefire MH90 body to use Scout or E-Series heads. This includes the Surefire M951, M952, M952V Vampire, M961, and M962. Any of our Scout Heads or MDC Heads will physically mate to this adapter. Please be sure to choose the correct voltage for your light. Also please note that converting a M961/962 will change it from a 3 cell light (9volt) to a 2 cell light (6volt).