Guns that shoot around corners are more than grist for the mill of an old Bugs Bunny plot in a Saturday morning cartoon. They’re real, and were first used, with limited success, by the German army in World War II. The weapon in question was the STG44 Krummlauf, a variant of the standard STG44 assault rifle. Why on earth would you want to shoot around a corner? The better question is why on earth wouldn’t you? It’s a lot safer than standing out in broad daylight where the enemy can take shots at you any old time they like. German...