In stock right now at EB Airsoft is a dummy version of the AN/PVS-31 BNVD under a brand called Arrow Dynamics. Good for some impressions though no purpose for an actual airsoft game, it comes with its own case and costs US$49.95. The real AN/PVS-31 is a lightweight dual tube gen 3 NVG that replaced the AN/PVS-15.