I have flown with rifles alot, have to be atleast 20x with air nz over the years and only once has one of them not maintained zero, it made it through the flight fine but i managed to drop it down a bank on day 1 and proceeded to miss 2 deer.
Provided its in a good hard case and there wasnt an underlying issue prior, im sure you will be fine. I always ask them to put plenty of fragile stickers on, and touch wood never had an issue.
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