Yes, there is a Tactical Assault Crossbow. It's for those times a can and subsonic ammunition just aren't quiet enough and there aren't any RPGs with bayonets anywhere nearby.
The Tactical Assault Crossbow is a modern arbalest upper that fits to an AR 15 platform lower. Watch the intro.
One model delivers up to 145 foot pounds of energy with a bolt (arrow/quarrel) traveling up to 402 fps.
Say what you like, it might be kind of fun. You know damn well Daryl Dixon wants one.
Information on the various models is available on their website.