Avatar Tonic writes:
TAC-15 'Tactical Assault Crossbow', the sort of crossbow designed for when aliens invade from another dimension. It actually replaces the upper receiver from an AR-15 so you can swap between assault rifle and crossbow with a little tinkering. The payoff is at the end when they sell you that it comes with a picatinny rail system. For, you know, when you need a grenade launcher on your crossbow.
Or as one of the commenters on the YouTube thread said, "Put a bayonet on it and you have the ultimate mall ninja weapon."
Available next month for $1,300.