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The shooter, gun crew, or close bystanders may perceive an increase in sound pressure level as well as an increase in muzzle blast and [[lead exposure]]. This occurs because the sound, flash, pressure waves, and lead loaded smoke plume normally projected away from the shooter are now partially redirected outward to the side or sometimes at partially backward angles toward the shooter or gun crew. Standard eye and ear protection, important for all shooters, may not be adequate to avoid [[Noise-induced hearing loss#Acute acoustic trauma|hearing damage]] with the muzzle blast partially vectored back toward the gun crew or spotters by arrowhead shaped reactive muzzle brakes found on [[sniper team]]s firing [[anti-materiel rifle]]s like the [[Barrett M82]].<ref name="Wieland2009">{{cite book|last=Wieland|first=Terry|title=Dangerous-Game Rifles|url=https://books.google.com/books?id=gn0YAwAAQBAJ&pg=PT550|date=15 October 2009|publisher=Down East Books|isbn=978-0-89272-902-9|page=550}}</ref>
Measurements indicate that on a rifle, a muzzle brake adds 5 to 10 dB to the normal noise level perceived by the shooter, increasing total noise levels up to 160 dB(A) ± 3 dB.<ref>[http://www.lima-wiederladetechnik.de/PDF/Finnish-Government-Silencer-Summary.pdf Summary of a Finnish government report (1992) on silencers, muzzle brakes and noise levels]{{dead link|date=February 2018 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
Brakes and compensators also add length, diameter, and mass to the muzzle end of a firearm, where it most influences its handling and may interfere with accuracy as muzzle rise will occur when the brake is removed and shooting without the brake can throw off the strike of the round.<ref name="Wieland2009"/>
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