![]() 22LR pistol (the Buckmark) and 10/22 rifle ( Feddersen-barreled Ruger). Once we add a suppressor can the breech report exceed the muzzle report? It turns out that it can if a gun is poorly tuned, but that with typical guns and loads designed for them it does not. I.e., some of the same propellant that produces the muzzle report comes out of the breech. This usually occurs while the bore still contains a significant amount of propellant pressure. Modern autoloaders use gas pressure and/or momentum from the discharged round to eject the empty case and load a new one. A common question is whether a suppressed autoloading (i.e., semi-automatic) gun is louder than one with a locked action. Are Suppressors Effective on Autoloading Actions? The shorter barrel produced peak sound pressures 3-7dB higher than the longer barrel (depending on the powder load, as we will see below). I also ran a variety of subsonic 300BLK loads through two different AR-15s using the same suppressor (an AAC Cyclone): one gun with an 8″ barrel, the other with a 16″ barrel. 25″ for the rifle) the muzzle report is about 6dB higher from the pistol. Shooting the same loads through a rifle and a pistol (barrel length with AAC Element II suppressor 9″ vs. 22LR ammunition we can see something interesting: Barrel length has a significant effect on muzzle report. (Without a suppressor the same loads meter about 148dB.) Is Barrel Length Still a Factor with Suppressors? 22″ bullet leaving a suppressed rifle muzzle at just 1000fps, make peak sound levels that are roughly the same as manually cycling the bolt of the gun shooting them: about 120dB. We may further reduce the nuisance and noise associated with gunfire by shooting subsonic loads to avoid the loud and unmistakable sonic crack created by supersonic bullets in flight. Hence, we put suppressors on our guns to bring their peak noise down to “hearing-safe” levels. Virtually all firearms create pressure levels above 140dB, which is the limit established in MIL-STD-1474D to avoid unacceptable hearing damage. This post follows the introduction to shots, pops, and sound pressure levels.
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