Poised to provide rock-solid stability, the Reaper Rail Upper Assembly provides users reliability in harsh environments. The Reaper Rail Upper Assembly mounts with a Picatinny rail to medium and heavy-duty tripods with 3/8-16 threaded studs and on tripods with an Arca Swiss mount. This patent-pending innovation eliminates the need for slight adjustments to the tripod if it is not leveled. Easily remove magazines with ease due to the Reaper Rail's offset design. The 11 degrees of rifle cant (both directions) gives users the opportunity to quickly level while setting up for hasty shots and provides a more compact, lighter weight alternative to the original grip without sacrificing stability.