This has been somewhat under the radar, but the atf has proposed rule (that you should go comment on, btw) that will make pretty much anyone who sells more than one, and maybe any, firearm to another individual in his own state, a criminal unless they go through an ffl.
They would be engaged in sales to make a profit. And even that may cause issues as there is the potential for the atf to inspect ffl records and see Joe schmoe has used the ffl to sell 10 guns in past year and is now an illegal businessman selling guns.
I'm attaching video that describes better than me, I would suggest you watch if you have a predilection to buy a gun, use for a while and resell to an individual rather than trade in at a store.
These fellows also suggest stop tracking the cost of a purchase or keeping track of the value of a collection, as it can be used to show you are trying to make money on any sale. And to STOP using bill of sales. Change language to transfer of the weapon, and never put a dollar value in the transfer document.... just you are conveying ownership to Mark Gunman.
Video. These guys usually have good info for gunowners...
https://youtu.be/eu0u1s-5jCA?si=xxWBoZqx9SnBN24t
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