Many have paid attention to the fact that different assault rifles have different front sight attachments. For example, in the domestic Kalashnikov assault rifle, it is installed on the very edge of the muzzle, while in the American M16 rifle, the front sight is placed much closer to the gas outlet. What is the reason for this difference and is there any fundamental difference in the location of the sighting devices?
So, the first thing to understand is that mechanical sighting devices for handguns are made up of two main "prefabricated" components. The first is the mechanical sight itself (aiming bar) in its entirety. The second is the front sight. The next thing to understand is the main rule of aiming. If we omit details that are unnecessary for us in the context of this conversation, then the essence of the rule boils down to the following postulate: the longer the aiming line, the higher the accuracy of the shot.
In other words: if the aiming line formed between the aiming bar and the front sight is too short, then the arrow becomes very uncomfortable to aim, and the risk of error during shooting is strong increases. As a result, the accuracy of firing is reduced. In this case, the aiming line should not be too long, since otherwise it will be too difficult for the arrow to focus his gaze. The optimal distance between the aiming bar and the front sight is considered to be a distance of 350-400 mm.
Another important point to consider when talking about weapon design is cost and manufacturing complexity. Attaching the front sight to the edge of the barrel is a much more expensive solution (due to the greater complexity of production) than attaching the sighting device next to the gas outlet.
Actually, all the differences in the location of the front sight on firearms from different manufacturers dance from all of the above. The place of the front sight is determined by the initial location of the aiming bar, as well as the desire to achieve balance on the swing, the price of production - the nominal accuracy of the weapon. The installation location of the aiming bar, in turn, is dictated by the rest of the weapon design.
So, all the same AK-74 uses a receiver, which makes it impossible to install an aiming bar next to the butt, and therefore Kalashnikov had to carry the front sight to the edge of the muzzle. The Americans use a different layout in their AR-15s. Together with the receiver, they have a bolt box, which allows the aiming bar to be positioned closer to gas shooter, which means it makes it possible to move the front sight from the edge of the barrel closer to the gas exhaust mechanism.
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At the same time, there are enough cheap weapons in the world (as a rule, these are local clones of Soviet AK, American AR and Belgian FN), where the designers, in order to save money, made a very short sighting line. As a result, the accuracy of firing from such rifles, to put it mildly, left much to be desired.
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Continuing the topic, you can read about Are Vladimir Putin's bodyguards allowed carry arms during overseas visits.
A source: https://novate.ru/blogs/140820/55678/