In some embodiments, a device includes a firearm holder including a stock lock. The stock lock may include a first jaw, a second jaw, a pivot pin to couple the first jaw to the second jaw. The first jaw may pivot about the pivot pin relative to the second jaw and may open and close about a neck of a stock of a firearm. The stock lock may further include a rotatable element coupled to the first jaw to allow at least a portion of the first jaw to rotate about the rotatable element to move into and out of alignment with the first jaw. In some implementations, the stock lock may include a locking mechanism. In some aspects, the stock lock may include a cowl extending about at least a portion of the locking mechanism.