Not that we recommend becoming an assassin or anything, but if you're looking for ultra-low-noise BB shooting with pinpoint accuracy, the UTG Model 700 FPS-325 Accurate Shot Competition Master Sniper airsoft gun is for you. It's a spring-loaded air gun that shoots .20g BBs, and it must be cocked every time you shoot it, but that can be done with just one finger. Its effective range is between 150 and 170 feet, perfect for some challenging target shooting.
Now we'd never shoot this anywhere near any human beings, but we've seen far too many garden-hungry varmint rabbits marauding around the premises here that could use a good plinking. Save the cheerleader, save the world and save the azaleas for $86.95.