Beretta kick-off system for xtrema 2 synthetic stocks FEATURES:-Kick-Off hydraulic dampening reduction system reduces recoil an astounding 44% more than its closest rival by using two hydraulic recoil dampeners incorporated into the stock "spacer" unit-The recoil energy is gradually dissipated by the hydraulic dampeners, resulting in superior comfort for the shooter-Fits Xtrema 2 & Urika 2, synthetic stock only