got this from a buddy who got a electronic information thing for all arms from all countries.
Model 58 7.62 mm assault rifles
Development
The Czech Army is equipped with the Model 58 rifle (Samopal vzor 58), an indigenous product of
original Czech design. The earliest known versions had wooden butts, pistol grips and fore-ends, but
most production weapons have wood fibre-filled plastic for those parts. There are three standard
versions: the Model 58 P which has a solid butt and is the normal infantry rifle; the Model 58 V which
has a folding butt; and the Model 58 Pi, which is a P version with a long dovetail bracket on the left side
to accept a night sight. This version is usually seen with a light bipod and an enlarged conical flash
hider.
The Model 58 bears a superficial resemblance to the Soviet AK-47 but there are considerable
differences.
The Model 58 is no longer in series production although it remains available from Ceská zbrojovka
a.s. By 1998, numerous Czech Army Model 58 rifles were becoming surplus to requirements and were
being either stockpiled or considered for alternative uses. One possible new use is seen as a low cost
sniper rifle. This alternative was developed by the Military Institute for Weapon and Ammunition
Technology (VTUVM) at Slavicin. Details are provided under Variants in this entry.
Numerous Model 58 rifles in a new or as-new condition have also been updated by the addition of
various combat accessories and are now marketed by Caliber Prague Limited. Details are provided
under Variants in this entry.
It has been suggested that the Model 58 rifles currently held by the Czech armed forces will be
replaced by CZ 2000 5.56 mm rifles. However, it seems that a general lack of defence funds within the
Czech Republic will delay any such course of action for the immediate future.
Description
The Model 58 is gas operated with a vent, 215 mm from the breech face, opening into a cylinder placed
above the barrel. There is no gas regulator and the full gas force is exerted on the piston-head. The
entire piston is chromium plated to prevent fouling. The gas pressure can drive the piston back only
19 mm and the shoulder on the shank then butts against the seating and no further movement is
possible. There is a light return spring held between the piston shoulder and the seating which returns
the piston to its forward position. The cylinder is vented on the underside and the gas pressure gives the
piston an impulsive blow before exhausting to atmosphere after the piston has gone back 16 mm. There
is a protective metal heat shield over the piston, covered with the wood-filled plastic used throughout
for the furniture. It is exactly the same shape as that in the AK-47 and is removed by withdrawing the
pin passing through the rearsight block in which the piston sits.
The short tappet-like stroke of the piston strikes the breech block carrier and drives it rearwards. After
22 mm of free travel, an inclined plane on the carrier moves under the locking piece and lifts it out of
engagement with the locking shoulders in the steel body. The locking piece swings and this movement
provides the leverage required for primary extraction. The breech block is then carried rearwards
extracting the empty case from the chamber. A fixed ejector in the receiver passes through a groove cut
in the underside of the bolt and the case is flung upwards clear of the gun. The continued rearward
movement of the carrier and bolt compresses two double-coiled helical springs. The larger of these fits
into the top hole of three drilled in the carrier and the smaller rests in the hollow steel tube which acts as
a hammer. The carrier is driven forward and the feed horns on the underside of the bolt face force a
round out of the magazine and into the chamber. When the round is fully chambered the carrier still has
16 mm of travel and, as it advances, a transverse cam face forces the locking piece down and the two
lugs enter the locking shoulders in the body. It should be noted that the weapon can be assembled and
fired without the locking piece, which could lead to a serious accident.
Unlike the majority of self-loading and automatic rifles the Model 58 does not have a rotating
hammer which strikes a firing pin; the hammer is a steel bar hollowed from one end almost throughout
its full length to take the hammer spring. At the open end a bent is welded and there is a groove cut in
each side of this to slide on the receiver guideways. This hammer enters the hollow bolt and drives a
fully floating firing pin forward.
The selector is on the right-hand side of the receiver; single shot is indicated by `1' and full automatic
by `30'. At the `safe' position, with the selector pointing vertically downwards, the trigger bar and the
disconnector are lowered so there is no connection between the trigger and the semi-automatic sear
which holds the hammer.
Variants
7.62 mm Mk 58/98 sniper rifle
The 7.62 mm Mk 58/98 sniper rifle was introduced in 1998 as a low cost sniper rifle using the Model 58
and its components as a basis. Few details of this rifle have yet been released but, from a brief
examination of a single example, possibly a prototype, it appears that most of the original Model 58
assault rifle has been retained but allied to a longer barrel with a CZ 2000/M16A2 pattern muzzle brake.
As far as can be determined the rifle fires semi-automatic only. The ammunition continues to be 7.62 ×
39 mm so the maximum effective range is limited to 600 m. An optical sight is provided on a raised rail
over the receiver, along with back-up iron sights. Other features include a folding butt-stock, a revised
and enlarged foregrip housing a folding bipod, and a 5- or 10-round box magazine. Weight is 3.82 kg
and length with stock extended is 1.09 m (870 mm with stock folded). Muzzle velocity is 760 m/s.
7.62 mm Model 58/96 GR Bison
This is a standard Model 58 updated by the addition of a Romanian 40 mm grenade launcher, the AG-40
Model 80, marketed by ROMARM. The launcher has a maximum range of 400 m. Weight of the rifle
with the launcher attached is 4.4 kg.
7.62 mm Model 58/98 GL
This is a standard Model 58 updated by the addition of the 40GL 40 mm grenade launcher produced by
Singapore Technologies Kinetics. The grenade launcher, complete with pistol grip, is secured to the rifle
using a special underslung bracket. The launcher has a maximum range of 400 m. Weight of the rifle
with the launcher attached is 4.49 kg.
7.62 mm Model 58/96 SD Zmije
For this model the Model 58/96 SD Zmije is provided with a sound suppressor, 300 mm long, 45 mm in
diameter and weighing 790 g. Weight of this variant, empty, is 3.89 kg and it is 1.145 m long. A variant
of this model is available with a retractable butt-stock; it is capable of accommodating a bipod and night
vision sights.
7.62 mm Model 58/96 Vyr
For this model a standard Model 58 is provided with a Pilkington Kite weapon sight. Other additions
can include a bipod and a muzzle flash eliminator.
7.62 mm Model 58/96 TR
On this model a laser aiming device is added secured under the barrel with the actuator switch fastened
by a tape around the foregrip. The weight of the rifle empty but with the laser device in position is 3.355
kg. Other additions can include a bipod and a muzzle flash eliminator.
7.62 mm Model 58/96 LS Sova
This model is a standard Model 58 provided with an under-barrel infra-red laser aiming device with an
output of 1.5 mW and an emission wavelength of 810 nm. The device weighs 255 g without batteries or
mounting adaptor.
Specifications
Basic Model 58
Cartridge: 7.62 × 39 mm
Operation: gas, selective fire
Locking: pivoting locking piece
Feed: 30-round box magazine
Weight: with empty magazine, 3.1 kg; loaded, 3.6 kg
Length: butt retracted, 635 mm; butt extended, 845 mm
Width: 59 mm
Barrel: 390 mm
Rifling: 4 grooves, rh, 1 turn in 240 mm
Sights: fore, post; rear, tangent leaf V-notch
Sight radius: 354 mm
Muzzle velocity: 687 m/s
Rate of fire: cyclic, 750-850 rds/min
Max effective range: 400 m
Manufacturer
Ceská zbrojovka a.s.
CZ-688 27 Uherský Brod.
Marketing agency
Caliber Prague Limited, Rejskova 7, CZ-120 00 Prague 2.
Status
Available. Large numbers held in reserve.
Service
Czech Army. Sold on the commercial market.