Quiet

[GM4spd]

I have a single shot.177 break open piston type rifle. It's a GAMO 220
Hunter,very effective,have nailed fairly large critters at 50 yds,as
for power it goes thru an orange at 25 yds with no problem. It makes
a fair amount of noise,anything more quiet? Pete

[Quiet]

The Gamo Whisper series has permanently attached noise suppressors, which reduces their sound signature when fired.

BATFE have ruled that permanently attached silencers on air guns are legal and require no NFA paperwork.
Since the "integrated noise dampener" is permanently attached to the air gun, it does not meet CA's definition of a silencer and is CA legal.

[PNut]

If you are worried about noise you should look into PCP. Cost a bit more to get into but it allows you to stretch out the distance and keep the sound down.

[Zenith]

Yes if you already have a break-barrel airgun, you could probably look into different OS' to broaden your horizons such as: PCP, CO2 or Pump. These alternatives will typically have a lower sound-signature than a traditional spring-configured airgun (AKA "Springer"). I would suggest looking into Crosman, Benjamin and Archer (QB Series).

But of course if you prefer the break-barrel OS, then the following should suffice: ND (Noise-Dampener) or Gas-Piston, or both. As far as what I can suggest, I would start off with something refurbished or re-manufactured to get a feel for what's out there; test the waters if you will. But GAMO or Crosman will be a good start.
In general the sound signature of any one particular airgun is going to be different because of how its configured and how it operates -- an airgun can be loud but with a quick sound duration, but be perceived as 'quieter' than something that's not so loud but that has a longer sound duration. I'm by no means a scientist or aficionado in this, but that is the gist of what I understood from something I had heard off of Pyramid-Air's Airgun Academy YouTube channel. Something about the DB, tis' strange but take a look!

https://www.youtube.com/playlist?list=PL74FF159FF533DDFF

http://www.archerairguns.com/default.asp

http://www.airgundepot.com/airguns-remanufactured.html#airgun-type=Air Rifles

http://www.airgundepot.com/airguns-remanufactured.html#airgun-type=Air Pistols

[mohsinj677]

Also, depending on which route you go with above will determine the fold orientation of the front-sight. Due to the small mounting-space and the differing heights of the surfacing there may be interference with traditional rear-ward folding front-sights. This can be solved either by reversing the front-sight so that it folds forward or by purchasing a specific sight that allows enough clearance above the handguard to flip backward, or by purchasing the adapter. So please be mindful when making your decision if this is important to you!

[ch60639]

The Stoeger X20 S in .22 cal is one of the quietest I have ever shot, its even quieter than Gamo series.
here is one of many reviews from youtube

https://www.youtube.com/watch?v=d70ONuSfJBY

it gets an honest 'mid 80's' decibel reading.

Like most springer air rifles, the 22 version shoots quieter in general than the 177 cal. because of a less violent spring shot cycle.

[BrocLuno]

I think my Bengie NP Varmint 22 is pretty quiet... The barrel should helps and so does the gas piston. More discussion here: http://www.calguns.net/calgunforum/s...d.php?t=951787

[ERdept]

The Gamo Whisper series has permanently attached noise suppressors, which reduces their sound signature when fired.

BATFE have ruled that permanently attached silencers on air guns are legal and require no NFA paperwork.
Since the "integrated noise dampener" is permanently attached to the air gun, it does not meet CA's definition of a silencer and is CA legal.

Not only that, the air gun is not a firearm.