(57) 57 An assembly for converting an automatic pistol to a single shot gun, including
a barrel structure (22) which is adapted to be detachably connected to the receiver
(10) of the automatic pistol and which movably carries a slide (23) mounting a bolt
(24) for front to rear movement relative to the barrel (16). The barrel structure
(22) has two rearwardly facing recoil shoulders (74, 79) engageable with spaced forwardly
facing shoulders (34, 39) of the receiver (10) to transmit recoil forces from the
barrel (22) to the receiver (10), with one of the four shoulders being formed by an
element which is threadedly adjustable to a condition assuring simultaneous engagement
of both sets of shoulders. A safety element (25) is operable to control actuation
of the firing pin by the hammer (19) of the gun, to prevent unintentional actuation
of the firing pin by the hammer (19), with the safety element (25) preferably being
connected to the bolt (24) for swinging movement about an axis extending longitudinally
of the barrel (16), and with the safety element (25) also desirable being actuated
automatically to a condition preventing firing of the gun upon pivotal movement of
the bolt (24) from a condition of locked engagement with the barrel structure (22)
to a released condition in which the bolt (24) can be retracted to open the rear of
the barrel (16). The bolt (24) may be constructed in a manner enabling a round to
be slidably connected thereto in a retracted position of the bolt (24), so that the
bolt (24) can positively advance the round forwardly into the barrel (22) and positively
withdraw the spend shell therefrom.
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