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I always thought it's because anything to do with, or any mention of actual supression will have the ATF up your japs eye within minutes - if you're in america that is.
I think they're all listed as fake suppressors globally because of americans. I could be wrong though.
I have one that has foam inserts, I can say I have noticed any reduction in noise though. The noise would come from the gun itself though not the propulsion of a bb out of the barrel surely?
it's to distinguish them from real firearm suppressors, most airsoft suppressors won't survive being put on the end of a real gun.
the majority of airsoft ones i've seen tend to have some kind of foam filling, usually foam donuts with a spring going up the middle. you can do some creative things with them but normally you'd expect the action noise to be a lot worse.
that said, on a boltgun, gas NBB or hpa system they can be very effective when the action doesn't make much noise they really do make a difference.
can't really say for brands, most of mine have come either indirectly (ie with the gun) or just cheap amazon special stuff.
you can mess around with the internals on them, stuff them with whatever you think will lessen the noise, of course the science (or possibly black art) of sound deadening isn't something i'm that good at.
i've not really done much scientific testing, but tbh i'd suspect the best thing to have is a lot of volume in which to catch the sound, but even a stubby suppressor can do an awful lot to drop the noise of the bb leaving the barrel.
I think they're all listed as fake suppressors globally because of americans. I could be wrong though.