Compatibility: Designed for use with Streamlight Protac Rail Mount 1 and 2 lights. Not compatible with Protac Rail Mount HL-X. Functionality: Allows integration with compatible Surefire Scout tailcaps and remote switches. Battery Stability: Features a removable buffer o-ring to secure the battery. Material: Constructed from CNC machined 6061-T651 aluminum with MIL-A-8625 Type III hard coat anodizing. Manufacturing: Made in the USA.