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Like he said check your state laws.
I've been using NVG's for the last 16 years and wouldn't buy a set for my own use. The maintainance involved isn't worth it to me. The intensifier tubes are nitrogen filled and the need to be purged at certain intervals to maintain the visual aquity(sp). If I were to buy a set I wouldn't buy anything less than a set with new not refurbished Gen 3 tubes. The refurb tubes typically don't last much beyond a year without continuous maintenance. IMO they are too much of a headache to deal with unless they are making money for me.
Edit:
PVS 5's were designed for aviation and haven't been used in aviation for nearly 20 years. The full face set up was a nightmare and the lithium batteries a pain in the rear. We were using the same battery when we switched to PVS6's for a while but started having problems with them melting down. Not a good feeling for something attached to your head.
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