Heh. If you want quiet, read up on the DeLisle Carbine (designed for special forces to remove sentries and that kind of thing; doesn't seem to be any louder than somebody clapping) and the soviet PSS (uses a special sealed cartridge where the powder forces a piston which in turn rams the bullet, so that none of the powder gasses leave the cartridge; almost totally silent).

Neither are really available on the open market, but they are fascinating pieces of engineering. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />