The S2 version has improved airflow characteristics and requires around 50 % less impact energy to open the valve to ready to fire . This makes the air rifle barreled action much quieter and extremely low in vibration. This was achieved by replacing the following components:
1. valve and valve tappet (the valve is real gold-plated).
2. locking head (visible through the real gold coating).
3. improved cocking piston.
4. new stabilizer, which has a higher mass and an extended adjustment range.
5th New barrel.
6. new pressure regulator.