This is the finger lever pin stop screw Winchester model 94 POST 64. The tip of this screw does not have threads on the Forearm. This screw is on the left side of the receiver closest to the Forearm, at the top of the receiver. This screw is usually replaced when a side mount receiver sight is placed on the gun. (along with the plug screws wp46 that will plug the holes on the back left of the receiver when the mount is removed)