A holster for a weapon, the holster having a hood assembly pivotably connected to the body of the holster, wherein the hood assembly is pivotable between a closed position for securing the weapon within the holster and an open position for insertion or removal of the weapon; a locking mechanism securing the hood assembly in the closed position when a weapon is held in the body cavity; a release mechanism associated with the locking means for releasing the hood assembly to the open position for removal of the weapon; and a mechanism for automatically pivoting the hood assembly to the closed position and thereby automatically engaging the locking means upon insertion of the weapon into the body cavity, wherein the mechanism for automatically pivoting the hood assembly includes at least one pivot arm that extends from the hood assembly to a pivot plate.