Burst Review spends time explaining the Wolf A1 Upper in detail. At last Big 3 East Media event, Wolf Ammo unveiled their Wolf A1 upper. Check out the post I wrote last October to refresh yourself.
Having shot the Wolf A1 upper myself it works very well suppressed. There is a hint of gas to the face but not nearly as bad as one would expect in a direct impingement setup.
Burst Review also made a disassembly guide for the Wolf A1