There was an excellent review of many of the different suppressors that were on the market about 12 mo ago. Rod and Rifle Oct/Nov 2017. 30 different models/suppliers under standardised test conditions.
Summary table
Suppressors listed in alphabetical order. Noise reduction values in last column. The best noise reduction values in this tests were in the 28 —32dB range. Only 5-6 models achieved that level
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