Those Philippine slam-fire pipe guns were actually sold as souvenirs in national gun magazines when I was a kid in the 1950s. Probably made up for the sale, with a pine 2X4 stock. They DID go bang, and at VERY close range must have been effective no matter the projectile.
I recently read a biography of one of the American reserve officers who stayed behind in the Philippines and organized and led the resistance against the Japanese. The Philippino guerrillas asked for shotgun shells FIRST when asking for supplies from Australia; shotguns were their favorite weapon in the jungles. I suspect many were American shotguns left by plantation owners and other US citizens when they fled the islands or were interned. Many were probably the single shots all tropical poor people worldwide seem to get. They killed a lot of Japanese....
