Make Picatinny Great Again with the Patent Pending Arisaka Rail Slider. It transforms the Picatinny rail on your rifle into a multi-position sliding mount with a push button recoil lug. A unique detented knob is used to set sliding tension, accounts for out-of-spec rails, allows the mount to be removed or installed without having to slide it off the end of the rail, and can be quickly and easily tightened down for maximum precision.