61 Skorpion) is a Czechoslovak machine pistol 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 from 1963 to 1979.

A variant of the Škorpion, containing a synthetic pistol grip in place of the wooden original, was built under license in Yugoslavia, designated M84.

[2] In 2017, the Swedish Police Authority estimated that about 50 formerly deactivated weapons from Slovakia were in circulation among criminals in Sweden.

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 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.

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.

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.

The weapon comes with a cleaning kit, front sight adjustment tool, oil bottle and lanyard.