I like WOA, John is great to deal with and I've been extremely pleased with both their 18 & 20" barrels that I've got. Recently I've been playing with lighter 18" barrels for a new 3-Gun rifle so I put uppers together using the JP 18" 34 oz barrel and then I got a barrel from Loki Weapon Systems, their 18" double fluted barrel that weighs 30 oz and it's a tack driver. In fact I let a friend "borrow" the upper for a local match and the Nationals and he won't give it back now after shooting a 2.25" group at 300 - he even ordered a new 18" LWSF rifle from Loki. I've had a couple of the Loki 18" double fluted barrels and both have been accurate enough for me.
Thats almost exactly what I have been looking for. Do you know if it can be ordered with a rifle length gas system?