I'm not saying it's fake, but all those details could be faked by someone good.

I'd be much more impressed if the story of where the gun has been for the past XX years was included. You know, "My Uncle Jackass was hiding behind a bush stalking Nash Buckingham when he saw him leave the gun behind. He ran out and quickly secreted the gun on his person so no one could see it, then made it back to town and hid it under his Serta King for 52 years."