The quietest crossbow I've used by FAR is the Barnett RC-150. It's a very small, entry level x-bow. Not necessarily a high-quality x-bow, but it is very, very quiet. Only shoots about 260 fps, but it is also very small and compact. My friend let me use his several years ago when the limbs on my Horton had cracked. Used it (the RC-150) to take a nice buck. Every other x-bow I've shot was pretty loud....