FAB Defense makes Rifle Accessories to fit the VZ58.
The SA Vz.58 is a gas operated, magazine fed, selective fire weapon.
It uses more or less conventional short stroke gas piston, located
above the barrel. The gas piston has its own return spring. The locking
system features a linearly moving bolt (breech block) with a separate
tilting locking piece. The breech block (bolt) is located under the bolt
carrier, and the locking piece is hinged to the bolt and located under
it. The VZ58 fires from the closed bolt all times. When gun is fired, the gas
piston gives a short tap to the bolt carrier. After a free movement of
about 22 mm (.9 inch) the bolt carrier swings the locking piece upfrom
the locking recesses in the receiver, and thus unlocks the bolt. From
this moment on the bolt group moves back at once, extracting and
ejecting the spent case and chambers a fresh cartridge. At the end of
the return stroke the bolt stops in the forward most position against
the breech face, while the bolt carrier continues to move forward,
swinging the locking piece down and into the locking recesses, thus
locking the bolt to the receiver.
The overall system can be roughly
described as a mix between the Walther P-38 pistol and the CzechZB-26
(or British Bren) machine gun locking.
The charging handle is attached
to the right side of the bolt carrier.
The trigger / hammer unit also differs from the most common designs in
that it is a striker fired design. The massive cylindrical striker is
located at the rear, hollowed part of the bolt, and has its own spring
located under the bolt group return spring. The striker has a lug that
interacts with the sear and is used to hold the striker in the cocked
position. The overall design of the trigger unit is relatively simple
and has few moving parts. The safety / fire mode selector switch is
located at the right side of the receiver, and has 3 positions for safe,
single shots and full automatic fire.
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