Hog wash!
There is no such thing as a silencer for a supersconic 7.62 NATO rifle
The problem is that the “crack” of a high powered rifle has two sounds, the sound of the exploding powder plus the sound wave as the bullet exits the muzzle at 2,630 feet per second, mach 2, twice the speed of sound! (for .308 cal. and 7.62 mm bullets)
As we know from the SST airliners being forced to go Mach 1 supersonic over the ocean, the sound barrier cannot be silenced!
A rifle bullet goes supersonic while still in the barrel and the “crack” of the bullet exceeding the sound barrier can be heard in the form of a 70 degree cone emanating from the end of the muzzle.
Note that this is the reason why you cannot use a silencer with a high powered rifle.
The silencer cannot control the sound waves that are created inside the barrel when the bullet goes supersonic.
Phony revolver silencer
It’s all Hollywood, like putting a silencer on a revolver, not knowing that the space between the cylinder and the barrel emits a huge sound!
Silencers don't work with Revolvers