If you ever had a chance to hold a store from a Kalashnikov assault rifle in your hands, then you probably managed pay attention to the fact that on its back there is some kind of mysterious hole in a small diameter. The ammunition hardly needs ventilation. However, this "hole" is a very important structural element. Moreover, there are similar holes not only on AK stores.
First, you should explain how the magazine for an automatic rifle works. This thing works very simply. In a plastic (or metal) box for the size of the cartridges, there is a spring that holds the ammunition under tension. When one cartridge leaves the magazine, the spring expands and pushes the remaining up. Accordingly, when loading the magazine, the fighter puts in cartridges and thereby forces the spring to compress. The more cartridges are inserted, the more the spring is compressed.
Putting more ammunition into the store than its design will definitely not work. However, you can easily invest less. This problem is especially relevant in situations where a store with a too stiff (most often new) spring comes in. In order for fighters (especially inexperienced ones) not to make mistakes when equipping ammunition, indication holes are made in stores. In the regular AK-74 store, there is only one such hole and it is located on the back side.
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The operation of the indicator hole is very simple. If the cartridge is not visible in it, then the store was not fully stocked. If ammunition is visible, then the store is already full. Such a simple and effective solution makes it easier (and in some situations even prolongs!) The life of a soldier. It should also be added that different stores have a different number of indication holes. Moreover, these may not necessarily be holes. Sometimes these are entire slots, like in pistol clips. With the development of the arms business, the market began to come across completely unexpected ways of indicating ammunition. For example, there are clear plastic stores.
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Do you want to know even more interesting things?
How about reading about why the American marines were jealous of the Vietnamese with the AK during the war.
A source: https://novate.ru/blogs/100919/51690/