A weapons charge can ruin your life. Fuck, even a criminal mischief charge can fuck your life up for years. America is only the "land of 2nd chances" if you're rich and well-connected, everyone else is perpetually skating on razer-thin ice.
So if you're actually dumb enough to show up with illegal weapons in a district with the most restrictive laws in the nation for a man notorious for sitting on his thumbs while his supporters get their heads kicked in, good fucking luck in prison and remember to not drop the soap on your 1st day.