Abstract: A clip and indexing mechanism for a gas-operated gun which affords the visible inspection and incremental advancement and insertion of projectiles from the clip into the chamber of the gun. The clip is formed with a long narrow rectangular web across which are positioned parallel spaced cylindrical cavities, each containing a projectile and each cavity being individually sealed by a mechanically rupturable seal. The gun includes an indexing mechanism for indexing the clip but reciprocation of the breech block to withdraw a bolt or obturator from the clip, index the clip and then force the next projectile through the seal and into the bore also cocks the hammer and further reciprocation before firing the projectile then in the barrel does not operate the indexing mechanism. Releasing the hammer resets the indexing mechanism to index the clip.

Abstract: A clip for use with a gas-operated gun to package and supply to the gun hygienic projectiles for inoculating animals with a particular biologically active material. The clip contains a molded structure having a plurality of axially aligned adjacent cylindrical chambers receiving the implant projectile and each chamber is sealed by a rupturable sealing film at each end thereof. Indexing recesses are provided on said structure and associated with each of the chambers for indexing the clip in the gun to dispose seriatim the chambers in alignment with the bore of the gun.