A gun support system for supporting a firearm on a tree without permanently altering the tree. The gun support system has a supporting means for supporting a firearm, a mounting means for placing the gun support system against the tree, and an attachment means for temporarily attaching the gun support system to the tree. The supporting means allows the firearm to rest in a substantially upright position against it for easy and ready access by the user. The attachment means is adjustable for use on trees having different diameters. When disassembled, the gun support system is compact and lightweight for ease in transport and storage.