A device for adjusting the level of a shooting rest. The device includes a triangle-shaped insert having a sloped first side that can receive the shooting rest thereon. A second side of the insert includes a plurality of slots that extend along the length of the insert, toward the first side. Each slot corresponds to a different level in which the shooting rest can be adjusted to when the insert is engaged therewith. An aperture on the insert receives a cord, wherein the cord can form a loop around the shooting rest for securing the insert thereto. The device is used with an existing tree stand or, in some embodiments, includes a tree stand. The insert receives the shooting rest against the first side thereof and the second side further secures to the tree stand, thereby providing adjustability of the insert for repositioning the level of the shooting rest.