(57) A gun is provided in which the barrel (5, 29, 44) which defines a chamber (39) for
a shell or cartridge to be fired is movable axially to effect such firing. The barrel
(5, 29, 44) is of annular shape and is biased towards a breech block (16, 27) at the
rear end of a bore (4, 45) in a support or body (1, 28, 43) of the gun. A firing pin
(15) is conveniently fixed to the breech block (16, 17) as the barrel and shell or
cartridge strike same and the movement of the barrel (5, 29, 44) is controlled by
a trigger mechanism.
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