You hear this a lot. The short answer is “no”. Ray from TBAC started a thread on ARF recently that will be eye opening to some. They got an Ultra 7 back that had seen some 28K rounds of 6.5 CM through it. The silencer weight 10.5oz more than when it was new. Metered >20dB louder than it should. Data, video and discussion here: https://www.ar15.com/forums/Armory/...After-28K-rounds-of-6-5-Sound-Test/20-502930/ To be clear, this is a very different situation than the comment in my sig.