Gun support apparatus for supporting a gun or components of a gun for assembly, servicing, cleaning, or other gunsmithing operations. A vise may include one or more gun supports for supporting a gun. A gun support may include a magazine well insert receivable in a magazine well of a gun. The support may be pivotable and may include a hammer stop. A gun support may include a channel of tapering width which is pivotable for positioning a desired width of the channel for receiving a portion of a gun to be supported in the channel. A bolt support device may be used to mount a bolt for cleaning or servicing.