Quiet .177

If the price will fit your budget, there is a rifle that perfectly fits the description you listed. The .177 Daystate Air Wolf MCT with the Hugget moderator is crazy quiet! Also, there is no ping when the trigger is pulled - just an experience that something happened. At first it is easy to believe something is wrong with the rifle, due to the lack of typical mechanical noises and vibrations felt during the firing sequence of most air rifles. Try one if you can, it may be exactly what you are looking for.

The quietest .177 I own is the Air Arms Ultimate Sporter with Q-tec moderator. This is the FAC version and will produce 24 fpe, but you can dial it down to make a 10 meter AG out of it. You simply cannot hear it and at 12 fpe the sound is invisible to the ear. The accuracy, fit and finish are superb. I have a .22 Air Wolf MCT and the AA makes it sound loud, which I didn't think was possible.

AA/CZ s200 with a decent moderator? 
Huma makes a nice add on external reg.

"scrane"AA/CZ s200 with a decent moderator? 
Huma makes a nice add on external reg.

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Just tried mine with a Decimeater, which is similar to the Weihrauch Silencer... Extremely quiet. Even with the report virtually gone the action noise is very quiet, too. Altogether like a quiet cough: "keh"
I had been wondering what to do with the Decimeater... now I know.

I have the BSA Ultra SE, it is 12ft lbs.
Its is a fantastic back yard gun, and once moderated it is the quietest gun I own.
The next one from that would be the Brocock S6.
The S6 doesnt have the shot count but its quiet and very accurate as well.
Both guns are fine out to 40 50 yards, and both are repeatable one hole wonders.

Mark

"illegal backyard plinking"

wont help.

John

The s200 does not come threaded for 1/2-20. In fact there is a flat cut into the muzzle to hold an alloy set screw secured "muzzle brake". Adapters are commonly available and that flat allows for firm mounting of the adapter.
The trigger is OK. I haven't messed with mine, and it breaks cleanly. No creep. Trigger weight is relatively high at what I would estimate at 1-1/2 pounds. I imagine it can be improved, but probably not to match standards. 
I think you could probably put a CZ barrel on anything and it would shoot well. The receiver of the s200 appears like it evolved from a pistol action. Bedding and stock screw positions are very unusual. (Rear action screw extends through the grip just like a pistol.) Barrel band is a little funky, but can be easily opened up to free float the barrel. The rifle is very accurate.
In order to upgrade the gun with a regulator the airtube has to be of the quick fill variety. If the tube is a non QF you'll have to upgrade it before adding the regulator. Honestly, I am not inclined to add a regulator to mine. Shoots well without. But the option is there.
The s200 is not really one of my favorites. It has its place though, because it is very small, very light, very quiet, and very accurate. Power is limited by its design. I am happy to shoot mine at around 700 fps with JSB 8.4 for 9.0 fpe. I use it to shoot grasshoppers. I think you can get around 12 fpe if you crank it up. 12 fpe would probably increase the noise level.
I had been shooting the gun indoors with a skinny 5" TKO moderator. It was quiet, but not remarkable. Your post prompted me to screw on the Decimeater and now it's REALLY quiet. I think the kind of quiet you're looking for. 

I will also recommend CZ S200. Extremely accurate, light, joy to shoot with it.
I bought cylinder, quick fill and regulator from Altaros (200 EUR as a kit). If you decide to go with CZ, this is a must, best upgrade ever. Cylinder (alu) is 400g lighter then original. I have some 70-75 shots from 190-95 bars, JSB Heavy 4.5mm 775 FPS average. I am using original LDC from AA, little bit modified, very quiet. Huggett Belita is so so... and I made custom DIY LDC similar to HW (2 buffles, 3 chambers in it, big - small - big) and that one is extremely quit, hammer strike is louder then rifle report.

Mine is laminate, and I think it is the best of all. Laminate is so tough. Friend of mine has a green one, also very good, but laminate is better quality then a wood they used on green one.
Here is a photo with green one and my WC

Few more...



...and with 2 hunters.

"spysir""illegal backyard plinking"

wont help.

John

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Lol I was thinking the same thing. Why try to help someone who is stating they are about to do something illegal? People get all scared and up in arms about higher power airguns being the downfall to regulation but its actually people who use any airgun illegally that is a bigger threat. Im actually surprised a mod hasnt done something with the post.

Deja, you are on sweet trouble, decisions decisions...tough decisions :-D.
Just to clarify, noise from hammer strike is very very quiet, that should not bother you. Just as Scrane sad, it is like quite cough.
Even though I am very fond of FX guns (my next one will be FX ;-)), I would not change my CZ for a Streamline, especially for the synthetic one. Royale 400... hmmm, probably.

PS. If you decide to with Sreamline, please promise me you will add a 100 a take a walnut, ...at least...lol