Sun Devil MFG has come out with a twin AR called the Double Devil.
It is two AR lower receivers attached to a solid upper receiver. At first glance it looks like two upper receivers connected by two bridges. The bridges are not separate. The upper receivers are actually one complete piece of metal.
It has a monolithic billet heavy wall twin upper receivers. BAD Lever compatible and integral picatinny top rails. Since it has two independent lower receivers, it can be fired simultaneously using both hands on their respective sides and pulling the triggers simultaneously. They are not linked together. The Double Devil gives a new meaning to “dual wielding”.