Mongooose, valve placement is an art not a science. You just have to figure out where you get the right FPS at and put some loctite on it.
Coincidentally I got my EdGi prototype barrel for my WE M4, aside from a little problem with the slot that holds it to the hop assembly, the gun is pin-point accurate. I'll be getting a replacement barrel sometime this week and I'll be putting it through its paces soon.
Its 6.00mm inner diameter smooth bore and extremely well made despite a small flaw in the slot. Like I said, I'm getting a replacement so we'll see how that turns out. After that, you can place your orders
