Bostonterrier has the right idea. Maybe we can neck the .50 bmg down to .17 and launch a projectile at such ridiculous speed that it breaks the light barrier.
The bullet will then go back in time and maybe influence particular left-wing (and certain right-wing) lawmakers with its tiny and harmless bullet and they will not pass such a meaningless law.
The bullet will then go back in time and maybe influence particular left-wing (and certain right-wing) lawmakers with its tiny and harmless bullet and they will not pass such a meaningless law.