Sa vz. 61 Skorpion

Ceska Zbrojovka Uhersky Brod (CZUB) · Submachine Gun · Discontinued · 1961

Also known as: Samopal vzor 61, vz. 61, Skorpion, CZ 61, Sa 61

Overview

The Sa vz. 61 Skorpion (Samopal vzor 61, meaning 'submachine gun model 1961') is a Czechoslovak machine pistol developed in 1959 by engineer Miroslav Rybar as his post-graduate thesis project at the Czech Military Technical Academy. Manufactured by Ceska Zbrojovka Uhersky Brod from 1963 to 1979, the Skorpion was originally designed to provide non-combat military personnel -- vehicle drivers, armored vehicle crews, officers, and special forces -- with a compact personal defense weapon offering greater firepower than a standard sidearm. Chambered in 7.65x17mm Browning (.32 ACP), the weapon is defined by its remarkably compact dimensions: at just 270mm with the wire stock folded, it fits inside a standard leather pistol holster. The Skorpion employs a closed-bolt blowback action with an innovative rate-reducing mechanism consisting of a weighted plunger in the pistol grip that temporarily locks the bolt rearward after each firing cycle, controlling the cyclic rate to approximately 850 rounds per minute despite the weapon's diminutive mass. With over 207,000 units produced, the Skorpion was exported to more than 20 countries and became one of the most widely distributed compact automatic weapons of the Cold War era.

Specifications

Weight (empty)	1280 g (45.2 oz)
Weight (loaded)	1530 g (54.0 oz)
Overall Length	517 mm (20.35")
Folded Length	270 mm (10.63")
Barrel Length	115 mm (4.53")
Height	108 mm (4.25")
Width	43 mm (1.69")
Sight Radius	148 mm (5.83")
Action Type	Blowback
Firing Mechanism	Closed Bolt
Trigger Type	Select Fire
Magazine Capacity	20 rounds
Magazine Type	Detachable Box
Muzzle Velocity	317 m/s (1040 fps)
Muzzle Energy	239 J (176 ft·lbf)
Effective Range	50 m (55 yd)
Maximum Range	150 m (164 yd)
Rate of Fire	850 rpm
Barrel Rifling	Right Hand
Rifling Twist	406 mm (15.98")
Number of Grooves	6
Frame Material	Steel
Barrel Material	Steel
Stock Material	Steel
Finish	Blued

Calibers

.32 ACP · primary — also known as 7.65x17mm Browning SR, 7.65mm Browning, .32 Auto, .32 Automatic, 7.65x17mmSR

Features

Firing modes: Semi Automatic, Full Automatic
Feed systems: Detachable Box Magazine
Safety mechanisms: Manual Safety Selector
Features: Select Fire, Folding Wire Stock, Rate Reducer Mechanism, Closed Bolt Firing, Compact Design, Threaded Barrel, Suppressor Compatible, Stamped Steel Receiver, Telescoping Bolt, Holster Compatible, Iron Sights, Flip Rear Sight

Variants

Sa vz. 64 — Different Caliber
Sa vz. 65 — Different Caliber
Sa vz. 68 — Different Caliber
Sa vz. 82 — Modernized
Sa vz. 83 — Different Caliber
Zastava M84 — Licensed Copy
CZ SA 361 — Modern Semi Auto

Service history

Operators

Czechoslovak People's Army · adopted 1961 · as Sa vz. 61
Czechoslovak Security Forces (StB) · adopted 1963 · as Sa vz. 61
Czech Armed Forces · adopted 1993 · as Sa vz. 61
East German National People's Army (NVA)
Yugoslav People's Army (JNA) · as M84
Libyan Armed Forces
Egyptian Armed Forces
People's Army of Vietnam
North Korean Armed Forces
Iraqi Armed Forces
Jordanian Armed Forces
Afghan Security Forces

Conflicts

Vietnam War (1955-1975)
The Troubles (Northern Ireland) (1968-1998)
Lebanese Civil War (1975-1990)
Yugoslav Wars (1991-2001)
Internal Conflict in Peru (1980-2000)
First Liberian Civil War (1989-1997)

Production

Estimated total produced: 207,000 · Production years: 1963-1979

Over 207,000 vz. 61 units manufactured by CZUB between 1962 and 2000. An additional 30,000 were purchased by Yugoslavia, which then licensed domestic production as the Zastava M84 from 1984 to 1992. Semi-automatic civilian variants continue production by multiple manufacturers.

Origin

Country of origin: Czech Republic

Designer: Miroslav Rybar

Discontinued: 1979

Notes

The Skorpion's most distinctive engineering feature is its rate reducer, a weighted plunger housed in the pistol grip that travels down a tube after the bolt reaches its rearmost position, briefly delaying the bolt's return. Without this mechanism, the lightweight bolt and low-powered cartridge would produce an uncontrollably high cyclic rate. The weapon ejects spent casings vertically upward through a port in the top of the receiver. Military testing demonstrated the Skorpion could place 20 rounds into a 220mm circle at 100 meters. The rear sight features a flip aperture with settings for 75 and 150 meters, though practical accuracy with .32 ACP is limited beyond 50 meters. Miroslav Rybar continued developing Skorpion variants in larger calibers (vz. 64 in .380 ACP, vz. 65 in 9x18mm Makarov, vz. 68 in 9x19mm Parabellum) before his premature death in 1970 at age 46. Yugoslavia purchased 30,000 units and subsequently licensed production as the Zastava M84. The weapon gained notoriety through its adoption by various non-state actors including the IRA during The Troubles, the Italian Red Brigades (used in the 1978 kidnapping of former Prime Minister Aldo Moro), and the German Red Army Faction. Semi-automatic civilian versions continue to be produced by Czech Small Arms and other manufacturers.

Background

The Skorpion was the thesis project of 35-year-old engineer Miroslav Rybar at the Czech Military Technical Academy, yet it required only minor revisions before being formally adopted by the Czechoslovak military -- a testament to the quality of its design. Development from concept to adoption took just two years, from February 1959 to summer 1961. The rate-reducing plunger mechanism was the key innovation that made the weapon practical, taming what would otherwise be an uncontrollable rate of fire. The Skorpion's extreme concealability made it a favorite of intelligence services and covert operators on both sides of the Iron Curtain, and its association with European terrorist groups in the 1970s and 1980s cemented its reputation as the quintessential clandestine weapon of the Cold War.