schematics for a shotgun, aka schematics for a shotgun, shotgun, and schematics

Instructions for making your very own Homekraft Sportsman Pro shotgun. There are detailed instructions, a list of components required and a picture of a sport hunter with a shotgun slung against his back, rubbing himself with animal dung.

It tells you how to make a pump shotgun with the following components:

1 - brick of quick-mold plastic
1 - firearm trigger assembly
1 - firearm breech assembly
1 - ammunition magazine assembly
2 - long steel pipes
1 - firearm sight assembly

Making this would take good familiarity with craft and good familiarity with rifles.
In the upper right corner is a note: 'First discovered by Dr. Dr.Crowley.'

It weighs about 100 grams. It is a gun schematic. You think it might fetch about $2 on the market.