These gas pistons are perfect spare parts for your VZ58! This is excellent PROJECT material! Well made and designed to take extreme pressure and temperatures. May show signs of wear, marring ,scratches, rust, etc... Parts must be inspected and tested by qualified and competent gunsmiths or armorers before use in a firearm. Not all firearm parts are interchangeable; use of surplus parts without proper knowledge could cause a firearm to malfunction and cause property damage, injury or death.