If your friends don't like watching action movies, playing videogames with you because you constantly say how unrealistic everything is or just start naming all of the guns you see.
When people ask you a gun related question they lose interest because the answer is so long and complicated.
If your friend tells you that his brother got a gun and you ask him what it was and he doesn't know.......so you proceed to ask him details about it so that you can figure out what it is so that you can say: He should have bought a...
If when you talk to someone you don't know at school and they say "You're that gun guy right?"
You almost never clean your house, but your guns are always spotless.
or if you undertake other hobbies (like leathercraft, reloading, wood finishing, lathe operation, metal plating, etc.) because it would be useful in furthering your interest in firearms...
If you have ammo that you need to buy a gun to shoot.