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I just got an AAC-M42000 suppressor for my Bushmaster (still waiting to get it). One thing that many people don't realize about the noise reduction in decibels is that it is a logrithmic scale. So compared to a -10db reduction, -20db is ten times the reduction. -30db would be 100 times as quiet as -10db. So if you compare a -30db to a -35db, it doesn't seem like that much of a difference on paper but the -35 is five times quieter!
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