Of course you won’t find one. It’s not like the suppressor follows the bullet to the target, then magically returns to the end of the barrel. You cannot suppress the shockwave of the bullet unless the bullet never produces one in the first place.
A suppressor only mutes the noises from the muzzle, reduces felt recoil, and pretty much eliminates muzzle flash. It won’t suppress any noise of the rifle itself, nor will it suppress any noise discharge from a GI bolt system.
The benefits of one still FAR outweigh anything else and the noise reduction is enough for me. If I could own one in this state, I’d hand load subsonic 5.56 as it’d give me a reason to. I want to make a sub sonic 300BO upper to hunt with. Suppressed would be great so i wouldn’t have to wear heavy ear protection which would allow me to hear what’s going on around em in the woods(animals, other hunters, etc)