An orbital cannon for 1 lb kinetic impactors. You’d probably want them to be in low earth orbit so they can strike quickly. This would of course require a constellation of satellite cannon systems, probably 2000 or so would be sufficient. Also, you’d want to be standing back from your target, probably 20 feet would be safe. Probably.

Also, they’ll have mixed results indoors, either putting holes through every floor above you or not quite reaching the target if you were at the base of a skyscraper. Probably not awesome for the skyscraper either…

Maybe someday everyone could have one of these for personal defense.