Saw this on GunBroker and just couldn't resist...goes to my SF Unconventional Warfare up-bringing. This is a Richardson Philippine Guerrilla Gun. Richardson led Filipino guerrillas against the Japanese in WWII. An amazing story, he wrote a book and two movies were made. He actually started a company in 1946 to sell this gun in the US. Richardson went out of business in '47. The gun sold for $17.00 , not bad but $10 more got you a real single bbl shotgun. It is a slam fire shotgun.