What is this thing? I'm having trouble tracking down an authoritative source (or even the origin of this photograph), but here's what's written on the sign:
This unusual item was captured by US forces during the Pacific Campaigns of World War II. It consists of a pistol known as the 7mm "Baby Nambu" and a samurai sword blade. This item was not a standard Japanese Army item and it is believed that the owner had it fabricated on his own initiative. It is further believed that it was intended to be used in frontal-type assaults.
Well, it's not a bad idea. But it has one obvious flaw: no place to mount a scope. I mean, really, who wants to go into battle with a sword pistol with only iron sights?