FYI they're made like computer processors. Some tubes are just better than others off the production line. Top 10% tubes go right to military application.
Brand new military gen1 just plain better than civilian bought gen1. Closest thing you can get is yukon for quality.
I know plenty of guys that have bought gen2 from the states, had no problems with US export/CBSA. If they ask, just say it's for varmint and coyote hunting lol