The Swiss recognized the same need as everyone else. They needed infantry capable of using precision rifle fire at range. But they didn’t have the time or budget to do it the same way as other military powers who stood up designated marksman programs. Instead, they developed a system that mixed a point blank zero with designated holdover points and controlled rapid fire instead of single shots. The called this concept Sniping 4th Generation, or S4G.
Most field shooters, from big game hunters to military members, do not have the luxury of time to check distance, adjust sights, and take a precisely aimed shot. In the real world, targets don’t want to be shot and they won’t expose themselves long enough for you to go through all those steps. So the challenge for the shooter is balancing accuracy requirements against available time.
The Point Blank Zero is one of the most important methods for doing this.
You can’t read any discussion about proper head position when shooting an AR-15 platform rifle without coming across the acronym “NTCH,” which stands for Nose To Charging Handle. Some proudly declare that shooting NTCH is the only “proper” way to fire an AR-15.