It is your right - both a God-given human right and a constitutionally protected legal right - but firearms are for all practical purposes illegal in DC. Go there with one and you can expect to be arrested if you use it to shoot a democratic voter in self-defense and are unable to escape from the police afterwards. Carry a flamethrower instead; it's legal and emotionally satisfying.
I’m a beefy critter, but toting around a flame thrower all day seems unnecessary.
My 10mm is big enough as it is.