A shotgun includes a forearm and a fastening mechanism that is used to couple the forearm to the remainder of the shotgun. The fastening mechanism moves between a first position where the forearm is coupled to the remainder of the shotgun and a second position where the forearm is uncoupled from the remainder of the shotgun. In one embodiment, the fastening mechanism is a lever-type fastening mechanism. In another embodiment, the fastening mechanism includes an anchor that is shaped to be received in a hole in a magazine of the shotgun. The anchor rotates between a first position where the anchor is unable to exit the hole so that the forearm is coupled to the magazine and a second position where the anchor is able to exit the hole so that the forearm is uncoupled from the magazine.