An AR and a Crossbow had a kid

I have no idea if this thing work reliably or not, but I want one for the cool fun factor.

Anyone have one, or seen it or shot it?

I don’t see that being accurate, but I bet it would be fun to play with!

Pse used to make a crossbow upper for an AR but it was just a regular single shot upper that clipped onto an AR lower. I think it’s long discontinued.