Modify-Tech have released their Barrel Spacer for their MOD24 Sniper Rifle due to customer demand... "The MOD24 barrel spacers have recently been the most frequently inquired, now we are going to release the barrel spacer for MOD24. The outside double O-rings to keep best position. We also add an O-ring inside each to stabilize the inner barrel and reduce vibration. The barrel spacer is made of POM. It is light and solid with the best material."