Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 26)

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c. Helmet Mount. The helmet mount secures the goggles to
the PASGT helmet, allowing freehand support for use with
weapon, protective mask or other purposes. The new helmet
mount is made of a ruggedized metal. The old one is made of
plastic. The metal helmet mount is the only replacement available.
Figure 1-3 shows the various versions of the helmet mounts.