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IDK, frankly why was it not added initially? Then again, this gun operates at a substantially lower pressure, so the bark would be less off the bat. I would suggest scouring all the intro videos about this gun and you will see them pull the mod apart, then judge for yourself.
It’s it NOT quiet, that I can tell you. Of course, this is a .30 cal, and I have nothing comparable to know for sure. I have not tried without the mod, but I’d imagine that once some more are in the wild, some mods to the mods will be happening.