The Diana RWS Model 54 Air King is a recoilless spring-piston air rifle that uses a floating action system: the internal action slides rearward inside the outer stock on recoil, absorbing the piston's movement before it reaches the shooter. This anti-recoil system allows the rifle to be scoped without the scope-destroying double recoil impulse of conventional springers. The 54 is the most accurate production spring-piston air rifle commercially available. Type: Rifle Action: Break-Barrel / Recoilless Caliber: 177 Capacity: 1 Year introduced: 1985, Germany Weight: 144 oz Overall length: 43.7" Status: Active Intended use: target, competition, field