Israel reportedly has US-made drones capable of launching grenades
 

Aerodynamics and physics dictate that you can't quite strap an assault rifle onto a DJI Phantom and expect it to fly and hit a target. Florida company Duke Robotics has apparently devised a way to keep a drone steady while compensating for a gun's re...
https://www.engadget.com/2017/07/06/...duke-robotics/