it's the future and drones with explosives on them may be a bigger nuisance than armed insurgence. my recommendation is a semi auto .410 with a detachable magazine. you won't need anything more powerful for shooting a quad copter drone. you can use it for bird hunting when supplies are cut, it's light and even if you can only squeeze off about 3 shots before a drone explodes in your face you'll probably want some spare shells for the second exploding drone.
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