Abstract: An implant gun for implanting an insert or pellet into or below tissue of an animal. The gun has a body comprising a barrel, a hand grip and a trigger mounted on the hand grip for successive manual firing operations. At least a portion of the barrel defines a guideway along which a series of pellets are movable to present each, in turn, to a discharge position from which it can be discharged from the gun. The body houses discharge and advance mechanisms, with the discharge mechanism being operable by manual operation of the trigger in a firing operation, to discharge from the barrel a pellet presented to the discharge position and the advance mechanism being operable to index the series of pellets along the guideway.