...You know when you've been Tam'd
...You base what you buy on wether or not it will imprsss C.R. or Skunky
.... You have inventoried your BOB lately
....You can participate in both sides of the 9mm v 45acp, m14 v garand, AR v AK, debate.
...You can quickly come up with id for some/any unknown or arcane ammo or gun
...you have ammo, brass, mags ETC for some gun you either no longer own or will eventually
...mostly you know what will tick off Art's GrandMaw
...YOU Know the 2A, and most of the others by heart