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A Multi Shot Air Gun
How about this for a multi shot gun?
The top picture shows the whole gun.
There are 12 barrels <1" I.D.>attached to 2 rings.
The barrel assembly surrounds a 24" X 4" main air
chamber.
Inside the main air chamber is a smaller 1" or maybe 1
1/2" X 26" secondary chamber located in the lower side
of the main chamber.
The secondary chamber is filled from the main chamber through a
pressure
regulator,<Black thing located at the end of the gun> set
at a pressure lower than the main chamber.
After each shot the main chamber refills the secondary
chamber.
The gun is fired through a 1" solenoid valve<green
thing>located at the back of the gun.
Triggers and batteries are in the handles.
The barrel assembly is held in place by a ring around the main
chamber and just out side each end of the barrel ring assembly.
<it is the red ring in the second pictuer>
The barrel assembly can be rotated by hand or mech.. device and
each barrel would be lined up with the "firing" barrel
by means of a simple detent made from a spring and ball
bearing and falling into a drilled hole in the barrel ring.
There would be a few more details to work out and I would make
the barrels extend to the end of the main chamber. It would not
be hard to attach the handles on a brace from front to back of
the gun.
In place of the main chamber could be a smaller tank the is
hooked to a compressed air supply with a hose.