US Patent 11644257 Auto-locking magazine extension

A magazine extender is provided. The magazine extender includes a baseplate structured to receive a lower open end of a magazine; a side bracket structured to couple to the baseplate for securing the magazine; and a locking pin selectively moveable into a locked position to lock the side bracket to the baseplate and an unlocked position to unlock the side bracket from the baseplate. The locking pin of the magazine extender is prevented from being moved to the unlocked position by a handgrip of a firearm when the magazine is inserted into the handgrip.