Have more control and get faster follow up shots with the Kynshot Mossberg 500/590 Tactical Conversion Kit. Reduce felt recoil from your shotgun by up to 80%, cut down on shoulder fatigue and get and stay on target quicker. KynSHOT TACTICAL hydraulic recoil dampers for shotguns are sold both standalone, and as part of a complete modification kit. They typically take less than 20 minutes to completely install using only ordinary hand tools. Careful damping fluid and seal selection allow the device to perform equally well over a wide range of temperatures from -30F to 160F.