Get a double barreled shotgun.
“If there’s ever a problem, just walk out on the balcony here–walk out, put that double barrel shot gun and fire two blasts outside the house — I promise you whoever is coming in…”
…will be taken care of by the sub-machine gun armed Secret Service agents stationed around the grounds.
By the way, when I was in Washington DC two years ago, the car I was riding in was forced to pull over by a convoy of vehicles with flashing lights. The last vehicle in the convoy was an SUV with an M-248 machine gun mounted in the back. I asked my driver WTF? He said it was Biden going from the Capitol to the White House complex.
But hey, you don’t need and AR-15. Get a double barreled shotgun and expend all your ammo in the air.