I was gonna say prop or "cosplay" gunLooks like some kind of silly prop gun.
I've seen a co2 powered revolver that can shoot hard rubber or pepper balls, that some advocate using for self defense. It kind of reminds me of that as well.
link lists it as,
Damn, you beat me to it. I've been wondering all day, and finally figured out why it looked to familiar to me.link lists it as,
"The Twitter owner also has a replica gun modeled after the Diamond Back .357 revolver featured in the video game Deus Ex: Human Revolution"