There are many secrets in this game some easy to notice some hard like the ps3 in the home, Detroit, and the mission were your Ellie in the town but this isn't about those it's about the 45 pistol you have in the game. If you've played the Uncharted series from naughty dog then you'll notice that the 45 defender in those games are the same as the last of us 45. It's a neat secret that naughty dog put in the game.