Silencers, also called suppressors, reduce the sound of a gunshot by 20 to 35 decibels on average. That brings a typical gunshot from around 165 dB down to 120–140 dB, which is roughly the difference between standing next to a jet engine and hearing a thunderclap. A suppressed gunshot is still clearly audible, but it’s far less damaging to your hearing and much less disruptive to the surrounding environment.
How a Silencer Reduces Sound
When a gun fires, hot gases expand rapidly behind the bullet and blast out of the muzzle at extreme speed. That sudden release of pressurized gas is the main source of the loud “bang.” A silencer is a metal cylinder, usually stainless steel or titanium, that attaches to the end of the barrel and forces those gases through a series of internal chambers divided by walls called baffles.
The baffles create a longer, more winding path for the gas to travel. As the gas moves through each chamber, it expands, slows down, and cools. By the time it finally exits the silencer, it’s releasing over a much longer period and at a fraction of its original speed. The bullet itself passes straight through the center bore without being affected, but the gas behind it loses most of its energy before reaching the open air. This is the same basic principle behind a car muffler.
Many silencers also include a larger expansion chamber near the muzzle end, giving the gas room to decompress significantly before it even reaches the baffles. Because the baffles contain gunpowder that’s still burning when it leaves the barrel, silencers also reduce or eliminate muzzle flash, the visible fireball that accompanies a gunshot.
How Loud Is a Suppressed Gunshot?
Even with a silencer, firearms are loud. The federal workplace safety threshold for impulse noise is 140 dB, and many suppressed firearms hover right around that line or slightly above it. Here’s what typical numbers look like:
- 9mm pistol: 157–167 dB unsuppressed, roughly 125–140 dB suppressed
- .223/5.56 rifle: 165–171 dB unsuppressed, roughly 130–140 dB suppressed
- .308 rifle: 167–173 dB unsuppressed, roughly 135–145 dB suppressed
- .22 LR rifle with subsonic ammo: 145–155 dB unsuppressed, often below 130 dB suppressed
The term “hearing safe” gets used loosely in the industry to mean below 140 dB. Some smaller calibers with the right ammunition genuinely reach that threshold. Larger calibers typically get close but don’t always cross it, so ear protection is still a good idea for most suppressed shooting.
Why Ammunition Type Matters
A silencer can only address one of the two sources of noise from a gunshot: the muzzle blast. The other source is the sonic boom created when a bullet travels faster than the speed of sound (roughly 1,125 feet per second at sea level). No suppressor can eliminate that crack.
This is why subsonic ammunition, loaded to stay below the speed of sound, pairs so well with silencers. With both the muzzle blast reduced and no sonic boom, the combination can produce what shooters describe as dramatically quiet reports. Supersonic rounds still benefit from a suppressor’s muzzle blast reduction, but you’ll hear the distinctive crack of the bullet breaking the sound barrier regardless.
Recoil and Accuracy Effects
Sound reduction is the primary purpose, but silencers also change how a gun handles in ways many shooters consider just as valuable. On average, a suppressor reduces felt recoil by 20% to 40%, depending on the caliber and design. A .308 rifle with a quality suppressor may see around 35% less recoil, while a 9mm pistol typically experiences 20–25% less muzzle rise. That reduction makes it easier to stay on target and recover faster between shots.
Accuracy is a more nuanced story. Many shooters find their groups actually tighten with a suppressor attached, thanks to the reduced recoil and muzzle disturbance. However, adding a suppressor almost always causes a small shift in where bullets land on the target. This “point of impact shift” happens because the added weight at the end of the barrel changes the way the barrel vibrates during firing. Lighter barrels are more sensitive to this effect than heavier ones. The shift is usually consistent and predictable, meaning you can simply adjust your sights to compensate. If the shift is inconsistent between installations, that typically points to a mounting or alignment issue rather than a problem with the suppressor itself.
Muzzle Flash Reduction
Because the baffles trap and cool gases that are still burning when they leave the barrel, silencers significantly reduce the visible flash at the muzzle. This matters most in low-light conditions, where an unsuppressed shot can temporarily compromise your night vision or make your position obvious. For shooters using night vision devices, flash reduction is sometimes the primary reason for running a suppressor, with sound reduction as a secondary benefit. The suppressor body itself will glow under night vision after sustained shooting due to heat buildup, which is a separate consideration from muzzle flash.
What Silencers Are Made Of
The three main materials are titanium, stainless steel, and a nickel-based superalloy called Inconel, each with distinct trade-offs.
Titanium suppressors weigh up to 40% less than stainless steel ones, typically coming in at 8 to 12 ounces compared to 14 to 20 ounces for steel or Inconel. That weight difference matters when the suppressor hangs off the end of a barrel you’re carrying all day. Titanium also resists corrosion well and has excellent fatigue strength, making it popular with hunters and precision shooters willing to pay a premium.
Stainless steel is the most affordable and handles regular use reliably. It’s heavier, but for shooters who aren’t hauling their rifle through the backcountry, the weight penalty is minor. Stainless steel suppressors typically need cleaning every 500 to 1,000 rounds.
Inconel is the heavy-duty option. Internal temperatures during rapid fire can exceed 1,000°F, and Inconel maintains its structural integrity above 1,200°F, far better than the other two materials. It resists erosion under sustained fire and can go 2,000 to 3,000 rounds between cleanings. The trade-off is weight (it’s actually slightly denser than steel) and cost. It’s the material of choice for military and professional use where the suppressor will see hard, high-volume shooting.
How to Buy One Legally
Silencers are legal to own in 42 U.S. states but are regulated under the National Firearms Act. Purchasing one requires submitting an ATF Form 4 application and paying a $200 tax stamp. Processing times have dropped considerably in recent years. As of early 2026, electronic Form 4 applications for individuals averaged about 10 days, with a median of 11 days. Paper submissions took around 28 days. Eight states prohibit civilian ownership entirely, so checking your state’s laws is the necessary first step.
The suppressor itself typically costs anywhere from $400 to over $1,500 depending on caliber rating, materials, and brand, on top of the $200 tax. Once approved, the suppressor is registered to you and has no expiration. It can be used on any firearm it fits, though it’s worth noting that most suppressors are designed for a specific caliber range.