I like to set up a M24 on a rooftop about a quarter mile away from myself every now and then. It’s rigged with a webcam on the scope, a actuator on the trigger and an autonomous drone that pulls the whole works up with a single rope attached in a way that dismantles the rig. As it flies in a random flight pattern, it identifies lakes and rivers and scatters pieces of the rig all over the city.  I haven’t hit myself yet, but when I do, no one will ever solve that case.