Not to call you an idiot on this but you're wrong.
Follow me on this and it should make sense if it doesn't...well. That's nothing I have control over.
An airsoft gun generates its compression from a a motor in the grip and gearbox housed in the lower receiver.
The round being expelled from the barrel makes very little if any sound. This is due in part to the fact that you simply have compressed air behind it and the round doesn't sit air tight in the hopup or the barrel.
The sound you do hear from an airsoft gun is from the motor, piston, gears and spring of the gearbox cycling.
The silencer does absolutely nothing to reduce the sound an airsoft gun makes. This is due to the fact that all the noise is generated in the gearbox housed in the lower receiver.
I'll bust out the taboo statment on here. I play airsoft. I've owned many airsoft guns and quite a few silencers for them. None, I repeat none of them come into the country with any kind of a baffle system in place. They show up with foam inserts.
99.9% of the people who use these silencers on their guns are doing so because they're running a longer inner barrel. The 0.01% that doesn't use them for the mock look they provide, uses them because they think it makes their motor/gearbox driven gun quieter.
Since that 99.9% of the logic driven population doesn't want a longer inner barrel sticking out of the end of their rifle they attach a silencer to cover it. The foam inserts help balance the inner barrel. It does nothing to reduce the sound.
Now, we could get into the gas guns as well but once again, the same principal applies. The noise is generated in the upper/lower receiver area and not from the projectile being expelled from the end of the barrel.
I honestly don't know where you got any of your information but on the subject of airsoft silencers making airsoft guns quieter you are quite wrong.
Wrong on both accounts.
Some airsoft silencers have metal baffles in them much like the real thing.
I have sound tested an empty silencer tube and that works shockingly well for what it is. So a foam filled tube would work even better and would produce an impressive sound reduction for a few shots if mounted to a 22 rimfire.
There is really nothing "fake" about an airsoft silencer. They work just as a real one would but are simply manufactured with materials more appropriate to the ammunition.