Simply stated: The Ransom Master Series Handgun Rest represents the handgun shooter we all wish we could be. It is a precision, passive device that holds, fires, and recoils as nearly like the human hand as possible. It eliminates the human inconsistencies that ordinarily make handgun testing unreliable. To properly use the Ransom Master Rest you must purchase the proper grip insert (sold separately). MidwayUSA offers Ransom's complete Grip Insert line.