Back in the day, double-action only revolvers were available and used for rapid-fire in some matches. Old cop friend shot competition with a Python. His department armorer drilled a small hole in the top portioh of the grip panel the size of a pencil eraser. Insert the eraser and filed down to the point when the tip of the trigger finger touched the eraser, the pistol would touch off. He was a really good shoooter with any handgun. Old-school improvised other stuff. One trick was to wrap rubber bands around the grips of their chief's special model 36's and carry them inside the waistband. Another stored his cigars in the muzzle of the upright riot gun in his patrol car. One slid down and he forgot about it. Supposedly bulged the barrel (I don't know for sure, it was part of the legends). Another had an accidental discharge in the police deparment parking lot with his 870 inside the patrol car, putting 00 buck not only through his car door but also into the Chief's car parked alongside. Sorry so far off-topic, got to remembering stuff again.