Guns

PepperBall,  Napalm cannon, Flame thrower under category http://sasecurity.wikia.com/wiki/Category:Guns

Net gun, http://www.protectglobal.com/  Fog dispersion system ,  http://www.smokecloak.com/en/

Gauss gun,Electric Cross Bow Rapid and automatic firing of bolts.

https://www.shotspotter.com/ trivial to Patents hack via Fronting company

Airtank airguns diy tank containers for co2

https://www.youtube.com/user/DemolitionRanch/videos demolition ranch channel

links
build sentry tower and object tracking with deep sort