Caliber: Sa.23 and Sa.25 9x19mm Luger/Para; Sa.24 and Sa.26 7.65x25mm
Weight: 7.2lbs (3.27 kg) or 7.7lbs 3.5 kg empty (with folding or fixed stock, respectively)
Length (stock closed/open): 17.5” / 27’” (445 / 686 mm)
Barrel length: 11” (284 mm)
Rate of fire: 650 rounds per minute
Magazine capacity: 24 or 40 rounds (9mm) or 32 rounds (7.62mm)
Effective range: 100-200 meters
Unlike most modern weapons this submachine gun does not have a selector switch to change from semi-auto to full auto but was designed to use light pressure on the trigger for semi or single shot fire to full trigger pull for full auto fire.
The weapons were produced from 1948–1968 by Czech arms designer Vaclav Holek at the Uhersky Brod arms factory.
The differences between the 7.62×25 and the 9mm versions can been seen by looking at the magazine and hand grip. The 7.62×25 chambered weapons has a forward leaning slope to allow for the round to be chambered properly in the weapon. The 9mm has a straight vertical grip and magazine.