www.ar15barrels.com would be happy to build you any kind of barrel or complete 6.8 upper you can dream up.
The only difference is that everyting I do is a custom one-off creation.
If you just want a basic cheap upper with the exact same profile/gas system/barrel length/production grade barrel blank, DON'T buy from me.
I'm nowhere near the pricing of Model 1, so don't even ask if that's your budget.
For anyone else, basic uppers start around $775 and go up from there depending on the specifics of the build.
I have several Rock Creek hand lapped stainless steel 6.8 barrel blanks in stock right now.
I can build you a basic upper (CMT M4 flattop, M4 feedramps, basic rifle-length freefloat tube and low profile gas system) with one of these blanks for $825 shipped.
You have total freedom of length, profile, gas system length etc...