GE-Minigun, seriously? Back off. You're wrong.
It is very well known through the industry that .45ACP is difficult to properly suppress, even though it's subsonic. The 9mm, being ~.355", can have a ~.400" bore, thus trapping gas for a longer time. The smallest bore on a .45ACP I've seen is ~.490", and it was STILL loud. To properly suppress a .45ACP, you need significantly more volume to capture more gas for a longer time - something rather impractical in a pistol-hosted silencer.
The BEST .45ACP can is still louder dry than some of the lousiest 9mm cans - wet, the 9mm STILL wins with subsonic ammo (which most people will use when using a silenced 9mm)
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