We've added our fluted barrels to the RRA web site (www.rockriverarms.com) , and because we knew the next question would be about weight savings, we've added weights to most o fthe barrels/barrel assemblies.  We're starting with the .223/5.56 barrels and will expand that information as the opportunity presents itself.
At present, substituting a fluted barrel or upgrading to one will require a call to RRA Sales/Customer Service.  It will be available as an on-line option from the product-specific drop down slections shortly.
Thanks.
Steve/RRA

Ordered one the other day. 

I had been looking for: (with not much luck.)

16" mid length.
1/8" or 1/9" twist.
A2 front sight.
Melonite or Hard chrome bore and chamber. (I know yours has neither)
The fluting sealed the deal. I always liked the looks of the fluting on the original ArmaLite AR10. 



Now, how long until you ship? 

Our fluted barrel isn't available in that configuration, but our AR0212ASY is a 16" Mid-Length HBAR with chrome-lined bore and chamber, 1:9 twist, and has an A2 front sight assembly as standard.  AR0213CLASY is the same thing in a lighter configuration.
Steve/RRA

I realize that. I ordered AR0210FASY knowing it doesn't have a hard chrome bore and chamber. It did have everything else I was looking for though.
1:9 twist
Mid length
A2 front sight
Fluting. 

Cool.
As long as it's what you want it to be, all is well.
Steve/RRA