Firing any firearm without hearing protection will cause damage. The 40SW is somewhere between a 38-357mag in sound depending on load and barrel. My belief is that every firearm should have a can!, but that does make it difficult to conceal, Laws,time, and money all play into that. My hearing is significantly damaged from 45+ yrs of shooting without protection for the first 20 yrs. I have tinnitus 24/7, the only thing that changes is how loud and irritating it will be at any given time. That being said, I will use my 40SW/12 ga/223 to defend my life in a hallway, BUT, I will be going out to finish zeroing a 300 blk with a can, sub sonic. If the 40 SW saves your life it can not be too loud, use protection any time you can. Be Safe,
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I BACK OUR BLUE
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