Latest item for you to use in upgrading your APS-2 SV, which is called an Integral Outer Barrel from X-Fire/PDI Japan... "This outer barrel is made with 2 parts which all machined. The section is the mid of the barrel side. But this is an integral model completely because we pressed 2 parts with 1t over, so these couldn't be un-stuck. About chamber, normal chamber is OK, but barrel spacer is for AEG-inner barrel, so that's not a good fit. Would it be OK, if you please use PDI's Hop Up Chamber.

This package has 4 parts.

1. Upper set with integral Outer barrel.
2. Silencer attachment(14mm positive)
3. Muzzle Cap
4. Barrel Spacer (AEG-Inner barrel)

Please use original parts for others."

Caution: Our products are for Original parts or PDI parts.Don't use the other makers."