Two Spacer are already included with the SSG10 A2 and the SSG10 A2 stock.
Are you a big guy with long arms? No problem. Just unscrew the two screws holding the recoil pad and insert two more spacers.
A rule of thumb is, that your triggerfinger should be 90° bent when the rifle stock is resting on your biceps. Watch the product video to learn more about it.
You can use a maximum of 4 spacers.