Many years ago I was on an international shooting team and one of the pistol events was called, “Free Pistol.” Some of the competitors modified their trigger so that they only had to touch a solenoid button to fire.
The following is a description of the event: 50 meter pistol, formerly and unofficially still often called Free Pistol, is one of the ISSF shooting events. It is one of the oldest shooting disciplines, dating back to the 19th century and only having seen marginal rule changes since 1936. It is considered to provide some of the purest precision shooting among the pistol events. The target of this event has not changed since 1900, and the 50m distance has remained the standard since 1912. The sport traced back to the beginning of indoor Flobert pistol parlour shooting in Europe during the 1870s.
Or as I called it, Space Gun.