Škorpion vz. 61

The '''Škorpion vz. 61' is a Czechoslovak 7.65 mm submachine gun developed in 1959 by Miroslav Rybář (1924–1970) and produced under the official designation Samopal vzor 61'' ("submachine gun model 1961") by the Česká zbrojovka arms factory in Uherský Brod.

Although it was developed for use with security forces and special forces, the weapon was also accepted into service with the Czechoslovak Army, as a personal sidearm for lower-ranking army staff, vehicle drivers, armored vehicle personnel and special forces. Currently the weapon is in use with the armed forces of several countries as a sidearm. The Škorpion was also license-built in Yugoslavia, designated M84. It features a synthetic pistol grip compared to the original version. A civilian, semi-automatic version was also produced, known as the M84A, also available in .380 ACP (9×17mm Short).

Operating mechanism
The Škorpion is a select-fire, straight blowback-operated weapon that fires from the closed bolt position. The cartridge used produces a very low recoil impulse and this enables simple unlocked blowback operation to be employed; there is no delay mechanism and the cartridge is supported only by the inertia of the bolt and the strength of the return springs. When fired, gas pressure drives the case back in the chamber against the resistance provided by the weight of the bolt and its two recoil springs. The bolt travels back, extracting the empty case which is then ejected straight upwards through a port in the receiver housing top cover.

The Škorpion’s compact dimensions were achieved by using a telescopic bolt assembly that wraps around a considerable portion of the barrel. The weapon features a spring-loaded casing extractor, installed inside the bolt head and a fixed, double ejector, which is a protrusion in the weapon’s frame.

As the bolt is relatively light, the Škorpion utilizes an inertial rate reducer device (housed inside the wooden pistol grip) used to lower the weapon's rate of fire from 1,000 rounds/min to a more manageable 850 rounds/min. The rate reducer operates as follows: when the bolt reaches the end of its rearward stroke it strikes and is caught by a spring-powered hook mounted on the back plate. At the same time it drives a lightweight, spring-loaded plunger down into the pistol grip. The plunger is easily accelerated and passes through a heavy weight which is left behind because of its inertia. The plunger, having compressed its spring, is driven up again and then meets the descending inertia buffer. This slows down the rising plunger which, when it reaches the top of its travel, rotates the hook, releasing the bolt which is driven forward by the compressed recoil springs.

Features
The weapon is hammer-fired and has a trigger mechanism with a fire mode selector, whose lever (installed on the left side of the receiver, above the pistol grip) has three settings: "0"—weapon is safe, "1"—semi-automatic mode and "20"—fully automatic fire. The "safe" setting disables the trigger and the bolt in the forward position (by sliding the bolt catch lever upwards).

The Škorpion uses the 7.65×17mm Browning SR (.32 ACP) pistol cartridge, which was the standard service cartridge of the Czechoslovak security forces. It uses two types of double-column curved box magazines: a short 10-round magazine (loaded weight—0.15 kg) or a 20-round capacity magazine (loaded weight—0.25 kg). The bolt remains locked open after the last cartridge from the magazine has been fired and can be snapped back forward by pulling the cocking handle knob slightly to the rear.

Sights
The Škorpion is equipped with open-type iron sights (mechanically adjustable forward post and flip rear sight with 75 and 150 m range notches) and a folding metal wire shoulder stock, which folds up and over the receiver and is locked on the front sight’s protection capture.

Accessories
The Škorpion, together with a short magazine, is carried like a traditional pistol—in a leather holster, and the two spare long magazines are carried in a separate pouch. The weapon comes with a cleaning kit, front sight adjustment tool, oil bottle and lanyard.

Variants


In the 1960s, three other variants of the vz. 61 were developed in Czechoslovakia: the '''vz. 64 (chambered for the .380 ACP (9×17mm Short) pistol cartridge), the vz. 65—designed for use with the 9×18mm Makarov cartridge, and the vz. 68''' (in 9×19mm Parabellum); however, production of these variants was never undertaken. In the 1990s Česká zbrojovka offered the following submachine guns: the '''vz. 61 E (.32 ACP version with a plastic pistol grip), the vz. 82 (chambered in 9×18mm Makarov and featuring an extended 113 mm barrel) and the vz. 83''' (for the .380 ACP cartridge). A semi-automatic only variant known as the CZ-91S was developed for the civilian market, available in the aforementioned calibers. The vz. 82, vz. 83 and CZ-91S pistols chambered in 9 mm use straight box magazines.

Users



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