As a further info: This weapon replaced all former types as scorpion, UZI etc. what was used beforehand for the STASI- (State Security - the east german secret police and intelligence agency/service) Anti-Terror-Commandos. So far as I remember the other models didn´t fit the requirements so well as the PM-63. The PM-63 could fire single shots, bursts and full automatic. The weapon was accurate and relatively light handable. Especially the weight, the fire modes, the minor seize and the accuracy in shooting made a good weapon for the east german secret commandos.