 61 is a Czechoslovak 7.65 mm or .32 ACP machine pistol developed in 1959 and produced from 1961 to 1979.Although it was developed for use with security 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, armoured vehicle personnel and special forces.The Skorpion's lower powered .32 ACP cartridge, coupled with a rate-of-fire limiting device housed in the grip (which allows a reasonable rate of 850 RPM with a relatively light bolt), also makes it easier to control in full-auto than the more common 9 mm Parabellum designs.