I lived in the middle east from 1978 to 1981. Lots of weapons like those shown in the pictures are made by local manufacturers with names you've never heard, like Misr and Insas and Tabuk. Some are made by manufacturers you might have heard, like Maadi. And we saw the occasional Type 56 with no identification whatsoever. Most were already 20 years old in 1980.
The quantity and type you see in those images are quite common throughout Africa and the East. That many AK and AKM clones in one spot are unusual to us, but ubiquitous throughout those lands.
The idea that all families have at least one: Most families can't afford them. Most people in that area of the world are unarmed simply because common folks make about a dollar a day for labor. With government controls on rent and staples, the family can get by from month to month. But buying a gun is way outside the means of common families.