Recently a terrible thing happened when interviewing military personnel from one black dot division: what does the number in the prime minister's rearview mirror say, the answer was received, it is the number of how many centimeters/circles to take from the center of the target. To say I was dumb would be an understatement. I could only say that the NSD is a must read… Gentlemen, if you pick up a thunder stick in your hands, learn how to use it properly! © Lieutenant.
N. on. Screenshot from the NSD for the Yarigin 9mm pistol, which explains that "the number on the rear sight indicates its group number" and depending on your STP you select the rear sight by its number.