Very good idea! 6 men with 22 caliber rifles, dead in a nanosecond at a very practical price. Hell, if I were the one being killed, I would rather get it that way than some others.
Plus you sometimes get some memorable quotes from the perps at the end like this one from the end of Breaker Morant
Harry Morant: Shoot straight, you bastards. - Don’t make a mess of it!