How to silence the muffler?

yes. There are two common mufflers: one is installed at the muzzle, and the other is integrated with the barrel. In the first muffler, the principle of noise elimination is that the gunpowder gas in the bore flows out of the muzzle and then decelerates step by step through the hole of the muffler, thus greatly reducing the muzzle noise. Because there is a certain error in the coaxiality between the hole of the muffler and the barrel bore, the bullet is affected when it passes through the hole of the muffler from the barrel, thus affecting the firing accuracy to some extent. In the second muffler, the front of the barrel is provided with a transverse exhaust hole and the outside is a sleeve. The sleeve forms an expansion chamber, and the propellant gas flows into the expansion chamber through the transverse exhaust hole. This integral silencing device is beneficial to ensure the shooting accuracy of weapons.

No matter what kind of muffler, it can only reduce the noise generated by gunpowder gas, but not by warhead shock wave. If the warhead flies at supersonic speed, the effect of the muffler is very limited, so the subsonic bullet should be used for the micro-acoustic weapon (at ℃, the speed of sound in dry air is 331m/s, and subsonic means that the speed of the bullet is lower than 331 m/s-editor's note).

so, can you achieve noise elimination without muffler? In fact, if the gunpowder gas can be prevented from being ejected from the barrel, the muzzle noise can be reduced. In 191, J Huth Fleece applied for a patent with the number of 5478 in Austria, which eliminated the weapon noise and recoil by adding a piston to the gun/bomb. He made the bore in the front of the barrel the same size as the diameter of the bullet, and the bore in the back of the barrel the same diameter as the shell. Then he put a piston in the shell. When shooting, the piston pushed the bullet forward. When it moved forward to the barrel, the piston was stopped, and the bullet continued to fly forward alone. There is a small hole in the barrel at the back of the piston, and the gunpowder gas is slowly released through the small hole. According to this scheme, after each shot is fired, the piston must be pushed out of the barrel from the rear with a through bar.

The Soviet Union has made bold practice in this field by preventing the gunpowder gas from flowing out to achieve the purpose of noise elimination and flame suppression. At the end of last century, the PSS pistol series introduced by the Soviet Union was made according to this principle. Different from the patent mentioned above, the piston of the bullet used in this gun is blocked in the casing, which saves the tedious action of ejecting the piston from the barrel.

The bullet used in p>PSS microphonic pistol is called 7.62×41.5mm SP-4 bullet, and 41.5mm means the length of the shell. The propellant of this kind of bullet is located under the light metal piston, and the tip in the center of the piston is inserted into the bottom of the warhead to position the warhead. The warhead is made of steel with a brass guide at its front end. The cartridge case is made of copper-plated steel plate. The primer is installed in the bottom socket of the projectile to ensure that it will not be ejected under the pressure of gunpowder gas.