From B.B. Pelletier:
a class three dealer examined it and said in his opinion it could not be removed and attached to a firearm with success.
Gamo has taken pains to make the outer case tapered front-to-rear, plus they have molded two huge flutes into the side of the case. They’ve also made holes in the flutes that expose the sides of the baffles, which are a soft synthetic material, to the air.
It was his opinion that the silencer would be too difficult to remove from the rifle without destroying it, and, even if it could be removed, that the baffles would blow out the sides if exposed to even the low pressure from a .22 rimfire cartridge. In other words, it wouldn’t silence a firearm for even one shot.

More here.
B.B. Pelletier reviews the Gamo Whisper, Gamo’s suppressed air rifle which I blogged about recently.

Noise is what the new Gamo Whisper is all about, and I’ll address that issue for you right now. I don’t find the Whisper to be that much quieter than any other spring piston air rifle of comparable power. In fact, my tuned .22-caliber Beeman R1, which has no silencer, is quieter because its powerplant makes less noise. The powerplant is where the bulk of the noise of a spring gun comes from, not the discharge at the muzzle.
More here.
Game have a new line of spring powered airguns with integrated suppressors.

They do not use the word “suppressor” which I find odd. Instead they call it “ND25 Noise Reduction Technology”… A suppressor by any other name.

The Whisper is a single cock break barrel action with a rifled steel, fluted bull barrel and an integral, non-removable noise dampener that reduces noise up to 52 percent. 2-stage adjustable trigger and automatic cocking safety with manual trigger safety. Fiber-optic front and rear adjustable sights. Includes 3–9×40 scope with a 1-piece solid mount. .177 caliber shoots 1200 fps with PBA ammo or 1000 fps with lead pellets. Weight: 5.28 lbs. Length: 43.5″.
More here.
Hat Tip: Saysuncle