All Skins for the Bull Dog Revolver?

So for some reason when I bought the Bull Dog, it shows that I have all of the skins unlocked for it. I'm not sure why, but I certainly don't. They don't show up in my inventory, but they do in my customization menu and I can equip them and use them in-game. I guess I'm not complaining, but just curious if anyone else has had this issue before. Screencap