This mod for the game is called Bullet Counted Reload System (BCRS). It adds a very useful function, which was impossible to do in previous versions of the game. Now, you can make your weapons reload more quickly. It is especially useful for those who play the game for a long time. For example, if you use the weapon a lot, it will be more convenient to have a fast reload.

Moreover, it is suitable for different situations such as 1st person and 3rd person.

BCRS is a full-f4se mod, which means that it doesn't require any additional files. It is an engine-level fix of an infamous Fallout 4 bug.