I like the idea of an airgun for taking small game, but I opted for a .22LR bolt action instead. I'm not sure a .22 Short (which can be fired from a .22LR bolt action rifle) is significantly louder than an airgun. A side-by-side comparison would be nice, but I already made my choice -- CZ makes a very nice .22LR rifle. No affiliation other than as an owner. But that doesn't answer your question.

Check Pyramid Air.