From Wikipedia:
R2-45 is a Scientology auditing process created by L. Ron Hubbard.
The process of R2-45 specifically pertains to shooting the target with a Colt .45 pistol, causing the victim’s “thetan” (soul or spirit) to leave the body (exteriorization). In 1952 during a meeting in Phoenix, Arizona, Hubbard demonstrated the process of R2-45 by firing a shot at the floor.