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I have doubts that this is genuine.
How it was lit? If he used a flash to photograph his hand in front of the gun, why is there no shadow on the background and gun, why are the shadows from the light source above the gun the only shadows?
If he didn't use a flash and simply increased the exposure to photograph his hand in natural light, then the gun (since it has additional lighting from above) should be over exposed or at least show blownout highlights.
The hand and the note look pasted in for me sorry hawkeye.