Saying non credible af here, but in theory one could add a upwards facing shotgun shells on top of the helmet, triggered by a Camera/proximity sensor if it detects a drone/falling grande. Maybe add a gyroscope to check if the helmet is actually facing upwards before triggering. All in all unit cost could be below 250$
- 6x 12 gauge shells with bird shot
- Raspberry pi type controller
- USB cam
- Laser distance sensor
- gyroscope
- servo trigger
With no barrel to really direct the velocity, wouldn’t it be more like attaching a tiny grenade or firecracker than a bullet? In that case the kickback force would be less than out of a regular rifle since the blast velocity is distributed in a radius and not in a singular direction.