Suppressors Do Not Work With Supersonic Rounds About weapon suppressors and speed of projectiles

[cyber_electrons 0]

Suppressors in rifles and pistols reduces the some of the energy of the projectile being fired. Sound energy will be reduced greatly and some of the kinetic energy as well (and some other). After the projectile leaves the barrel and the suppressor a much more silent noise is heard. Now, the suppressor works effectively with low caliber rounds which are usually subsonic rounds. But when a supersonic round is used, there is still a loud bang after going through the suppressor. The reason is that the projectile breaks the sound barrier and creates a sonic boom which is a loud noise. This the energy of the supersonic round had not been reduced enough to prevent the sonic boom. The suppressor also does not work with revolvers as everyone knows why, the revolver has a gap between the cylinder and the barrel.

[georgebaileyster 0]

Suppressors in rifles and pistols reduces the some of the energy of the projectile being fired. Sound energy will be reduced greatly and some of the kinetic energy as well (and some other). After the projectile leaves the barrel and the suppressor a much more silent noise is heard.
Now, the suppressor works effectively with low caliber rounds which are usually subsonic rounds. But when a supersonic round is used, there is still a loud bang after going through the suppressor. The reason is that the projectile breaks the sound barrier and creates a sonic boom which is a loud noise. This the energy of the supersonic round had not been reduced enough to prevent the sonic boom.

The suppressor also does not work with revolvers as everyone knows why, the revolver has a gap between the cylinder and the barrel.

In reality it is the other way around. The reason for the 'bang' is not the speed of the projectile but the fact of which on an automatic weapon the breach opens at the immediate point of firing, thus, although you have the suppressor (silencer) on one end, the sound will simply travel out the other as the case is ejected and the new round loaded. In a revolver, the breach is not open thus the suppressor (silencer) deadens the sound dramitcally.

[frozen.fish 0]

i thought suppressor and silencer were always different.

[cyber_electrons 0]

In reality it is the other way around. The reason for the 'bang' is not the speed of the projectile but the fact of which on an automatic weapon the breach opens at the immediate point of firing, thus, although you have the suppressor (silencer) on one end, the sound will simply travel out the other as the case is ejected and the new round loaded. In a revolver, the breach is not open thus the suppressor (silencer) deadens the sound dramitcally.

Of course there will be sound made from the mechanical actions of certain firearms. The sound of the bullet itself is reduced. But the sound travels much quicker than the mechanical action so the sound will escape before the breach is opened. Otherwise there will be 2 bullets travelling within 1 barrel. Also, for the mechanical action, it depend on whether the weapon is gas action or recoil. (You will know it if you know the AKs well - they are usually gas operated.)

The sound will travel through any gaps which, for example, revolvers have - between the cylinder and the barrel.

Have you ever heard of sonic boom? If you haven't, you should search it up. It happens to supersonic jets as well. So when the bullet travels faster than the speed of sound, the air is pushed with such force that it creates a sound. If the bullets speeed is maintained and still above speed of sound after going through the suppressor, there will be a sonic boom from the bullet - not that the suppressor is not working, but it is the bullet itself "AFTER" it leaves the suppressor.

Know more about sonic boom here:


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I learned the info to post this, also my first post of this topic:

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