For me, I came across some heavy regulations. People I got in touch with said anything that looks and functions like a gun/weapon will be heavily scrutinized.
No anecdotal evidence, but you need to transport it like an actual firing gun, keep all documents on hand and depending on the country you’re flying from you might need a separate permit as well. If you’re purchasing the airsoft gun abroad and plan to bring it to india, it’s kind of a hassle.
Not to get political, but with the current situation, I would HIGHLY recommend against traveling with anything that might be deemed as a threat, even if you have the necessary docs.