Quoted: With the 6.8 being a lower pressure load than the 5.56 already, I dont see the need for a mid length.
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I have to disagree with this statement.
I have it from a very good source that the first Remington 6.8 SPC ammo was running over 70,000 PSI when they warmed it up to 130 or 140 to simulate storage in the desert much like ammo the boys in the sandbox might be using.
This is the reason the new ammo is loaded to lower pressure/velocity now.
The more distance you put between the chamber and the gas port, the better PERIOD until such time that you don't have enough barrel past the gas port to get good function.
Keep 5" of barrel out in front of the gas port and all is well.
Randall