Abstract: An adjustable coupling apparatus for first and second spaced superposed bels of a sporting gun in which the barrels are secured at the rear ends thereof, to a mounting at the stock of the gun, the barrels projecting freely forward therefrom. The barrels are supported at the front ends thereof by a double collar which is fixedly engaged to the upper barrel and is slidably engaged with the lower barrel and holds the barrels in transversely spaced relation while permitting relative axial movement therebetween. A coupling device engages the barrels at an intermediate location along the length thereof for transverse adjustment of the spacing therebetween. The coupling device includes a rotatable wheel which can be rotated in opposite directions to increase or decrease the transverse spacing between the barrels. A detachable and interchangeable sight band is disposed above the upper barrel and is secured at its rear end to the mounting.

Abstract: A multi-penetration vaccination apparatus comprising a mounting having on e side a manually engageable portion for the handling of the apparatus and on the other side one or more levels of supports adapted for removable press-fit of one extremity of concentric sleeves, the free extremity of the sleeves and the central support having a plurality of points for penetration into the skin of the subject. Vaccine is supplied to the points so as to penetrate into the skin along with such points. The vaccine can be contained in a reservoir formed at the bottom of a cover which is mounted on the outer-most of the sleeves to form a sealed enclosure for such vaccine, the points being immersed in the vaccine. Alternatively, the central support can be formed with a bore in which a vaccine capsule is inserted so as to supply vaccine to the points at the time of penetration thereof into the skin of the subject.