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barrel and locking piece forward. The
locking piece will force the rollers
outward into the recesses in the slide,
locking the chamber.
The roller lock design is not as old
as the other short recoil designs, but
has found some military success. The
CZ 52, designed in 1952, was used
by the Czechoslovakian military and
saw almost 30 years of service. The
CZ 52 is a roller lock, short recoil
semi-automatic pistol chambered in
7.62x25mm Tokarev.
› Toggle Lock – The toggle lock
Figure 24: A roller lock short recoil action.
action, though similar, should not
be confused with the toggle delayed
blowback action. Unlike the blowback
action, the toggle lock action uses
moves rearward and the locking piece
a locked breech design. Much of
clears the rollers, the rollers will move
the toggle’s function through the
inward, clearing the slide and allow-
cycling process is similar, with the
ing it to travel backward.
only exceptions being the locking and
As the slide continues rearward, it will unlocking of the breechblock and the
extract and eject the empty case and recoiling barrel.
cock the hammer/striker. On its for-
The toggle lock action uses a multi-
ward stroke, the slide will strip a fresh
piece breechblock that is pinned to-
round from the magazine and feed
gether forming multiple hinge joints.
and seat it into the chamber. The slide
The front of the assembly is the
will contact the barrel and drive the
Figure 25: CZ 52 roller lock pistol.
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