There is Colibri (intended for handguns), and Super Colibri for rifles. The regular isn't recommended for rifles, because it might not clear the barrel. The Super, in a rifle length barrel, is as quiet as any air rifle (and quieter than many). In a 6" barrel, the Super is "Holy crap, get back inside before the neighbors call the cops!"
It's awesome for backyard plinking at 10 yards or less and easily shoots to minute-of-vermin at that range. I wouldn't trust its power for anything larger than a fuzzy tailed tree rat, though.
I bought a case of it some years ago and still have bricks left. I'd throw you a box, but we're too far away for FTF, and I'm not mailing it to MA.