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Hi Justin and welcome. This information is not put in any advertisements or reviews that I know of so I would ask FN Customer Service for direct decibel rating at 1-800-635-1321 or email customerservice@fnamerica.com --- https://www.thetruthaboutguns.com/fn-announces-its-first-suppressor-the-new-fn-rush-9ti/

Id try giving FN customer service a call For customer support, repairs and technical inquiries, call 703-288-3500 option 4 or sign into their customer service portal and submit your inquiry.

Hi Justin, FN does not state that information on this product, so I would call FN customer service direct and inquire at 703-288-3500 option 4 Stay safe & have a great day!