A gun vise comprises one or more supports that move between a folded state, an extended state, and a locked state. A support is movable in both a sliding and rotating motion via an articulating mount to transition between states. In the locked state, a support is seated within a socket of a base of the gun vise to rigidly hold the support in position. In the folded state, a support has a reduced vertical footprint, such as to facilitate storage and transport.