![]() However, regardless of this the 5.56×45 is a loud round even when suppressed because the round is breaking the sound barrier which creates a sonic boom. ![]() In this way, the decibel level is reduced. A suppressor aims to quiet the sound of the muzzle blast by trapping the expanding gasses from the end of the muzzle and allowing them to cool and decelerate in a series of chambers. There are three main sound sources made by an AR-15 when a round is discharged the muzzle blast, the sound of the supersonic slug breaking the sound barrier and the mechanical noise of the weapon cycling after each shot. However, if you are considering a suppressor for your AR-15 we should be candid about what it entails and what to look for. An AR-15 chambered in 5.56 is never particularly quiet due to a variety of factors. I pulled the trigger on my MK18 with a surefire suppressor mounted and looked back at Jason, an active duty military police officer, “That’s actually still kind of loud” he exclaimed while replacing his Peltor headset onto his ears.
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