Using energy for the monitoring of composites in a designated perimeter.
Frequency: Embedded RFID on registered firearms allowing perimeter monitoring via Radio Frequency reception tuned in to RFID frequency range.
Gravity: Upon reception of signal via RFID monitoring, auto-enabling Rare Earth electromagnets in entrance areas…..once engaged, microwaves monitor for firearm composites (via density detection) and initiate power needed to emit gravitation flux…of which, this flux is pre-set to strength needed for immediate attraction of composites contained in firearms and/or protective body armor detected.
In modern day terminology: One would see firearms, body armor, bullet proof vest, etc. stuck to the walls until power-down of system