SomoGear demo their dummy PVS-21 NVG. They have a version with the lens having an NVG light effect... "Constructed of durable nylon polymer to withstand impact on the field, it is compatible with NVG Helmet shrouds to enhance your airsoft loadout. It is a great addition for MilSim and training loadouts. This copy dummy design sports realistic knobs and markings. Your best choice of non-functional tactical gear."