Once upon a time, as a young air wing jarhead, I was part of a merry band of young jarheads with more ingenuity on hand than there was official work to be ingenious at. So we came up with the blowgun from Heck. It fire parachute rigger's needles (those things are BIG) using compressed nitrogen from a NAN-2 cart as the propellant. The weapon had a trigger group (actually a valve release) made out of brass in the jet engine shop. We used cut-up IBM punch cards as a combination fin and sabot. A Tasco rifle scope from the Marine Corps Exchange finished off the weapon.
We were bagging rats at 100 meters with our toy...
A six inch steel dart is not a prank ebven if it were not the age of terrorism there are many places on the human body where a six inch penetration of a stell dart can cause immediate death. This is someone using deadly force. Might I suggest a 180 gr silvertip response is very much in order. Of course this is DC and onl FLEAS, DC Cops and Democrat Politicians and columnists are legally allowed to carry.
Stay well - Stay safe - Stay armed - Yorktown