[fruser1]

Does the regulation apply if someone pays a deposit while they are giving the firearm a "test drive"?

https://www.youtube.com/watch?v=PqtjbWJPIgQ

[Aut Pax Aut Bellum]

You won't be able to "transfer" a gun to someone without a background check at a dealer. Hunting with a buddy and his gun is broken? Can't lend him the spare that you brought, illegal.
It is all about making every transaction go through the government who is registering them.