Two points to popularize by the way: The
"exercise round" that Bass fired on his comrades was an empty round to be precise. An empty bullet means no warhead, and its bullet structure, sound, smoke, gun flame, vibration, operation, and firearm operation are all the same as live ammunition; at close range of the muzzle, the explosive gas of gunpowder still has a certain lethality, if it is close Weak parts of the human body may still cause disability or even death. This is also the principle of the protagonist's strategy: pretending to panic and accidentally fired a shot in front of his teammates. This is in line with the actual situation. The muzzle is not necessarily aimed directly at the eyes. As long as it is close enough, the gun flame will still cause great damage to the eyes.
The square cover with a ring on the muzzle is a muzzle assist device, which has two functions: one is to prevent accidental shooting. After the cover is closed, it can clearly indicate that no live ammunition is used; even if the live ammunition is misused, it will hit the helper first. The retractor can shatter the warhead and change the trajectory, which can effectively prevent accidental injury. The second is to maintain the barrel pressure at the moment the bullet is fired, so as not to lose too quickly-because there is no bullet in the barrel, which means it is empty. The principle of modern automatic firearms is to rely on a part (a small amount) of gunpowder explosion air pressure to achieve continuous firing, and the other part (main) air pressure is to push the warhead out of the barrel to shoot at the target.
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