It combines the remarkable functionality of Caldwell?s Fire Control mechanism with the portability and stability of a stylish one-piece shooting rest. The innovative Fire Control system includes internal plates that slide up, down, left and right with movement of the control arm. Move the control arm and you move your rifle - and your crosshairs - a little bit this way or that way. The system gives you perfect fingertip control over the location of your crosshairs when the trigger breaks. No more squeezing, tugging, or shifting a rear bag, only to have crosshairs that move out of position at the last second.