They were smooth bore, free of serial numbers (shocking) short barreled and good for no more than 20 feet in distance, but more realistically 3-5 feet would be the practical range. These guns scared the enemy big time. They had to view every person as a potential threat. The psychological value of these guns was important. It put the occupying troops on edge. They would not be safe wondering around the towns drunk doing their occupying army thing. The gun came with instructions called comic book instructions.
Now lets jump forward to the Vietnam era. The CIA wanted something similar to be used in Vietnam. They developed a similar but a bit more sophisticated gun called the "Deer Gun".The US government knows that a country cannot easily be occupied if the population is armed. They also knew extremely simple "Saturday Night Special" type guns were enough to thwart the occupying army big time. Now mind you the people in the USA do not have junk pot metal liberator guns that look like Mattel Toy Company made them. They have sophisticated guns in many cases better than what the military has except for maybe the crack units like Navy Seals. The people in the USA also know how to use these guns.
Why An Occupying Army Would Fear the USA Gun Owners - An armed society is a polite society and a free society. Total occupation and enslavement becomes difficult, not impossible just a lot more difficult. The challenges facing an occupying Army from civilian owned sophisticated guns are deep and complex. I will go into some of them. We will cover types of guns and applications.