The Modlite 18650 Weapon Mounted Light Body is designed as a direct replacement body for the Surefire Scout Light M600DF weapon lights and KE2-DF heads. It will also fit all Modlite light heads. This body is compatible with Surefire Z68, Modlite TCC tailcaps along with Surefire UE and DS00 tail caps. It will also fit in any aftermarket Scout mount, as it retains the mounting holes and square lug interface on the underside of the light body. This light body is designed to accept 18650 cells primarily.FeaturesCompatible with a variety of tailcaps and headsMounting holes and square lug interfaceNoteLithium CR123 cells are not supported and if used will cause the cells to heat up and possibly explode or catch fire. Modlite recommends Modlite 18650 3500mAh Protected Button Top Cell. The Modlite 18650 light body is NOT compatible with the Surefire older Scout light heads. Also please note this item is just a light body and it not a complete light.