Yes, that’s a Leica gun camera. Looks like a blunderbuss to me. No idea when these were produced though I’d guess early 60’s at the latest.
This actually isn’t the first camera gun I’ve seen, though its the first with such a large stock. From what I’ve read they actually worked rather well to prevent shake but the idea never caught on. Probably a bugger to do street photography with this thing…
Anywho, Tamarkin is auctioning off this beauty late January 07 on ebay.
Source via BoingBoing