Quoted:
Theyre giving options, you can choose accuracy over chrome lining, which whether we need it is really kind of dubious. I can tell you the 5R rifling cleans just about as easily. So I guess if you are going to run a DIAS and live in the jungle you have a choice, if you want bragging rights on paper, you got a choice.
I choose chrome myself, only because Im wouldnt be as comfortable leaving the unchromed dirty and unoiled as long as I tend to do. I know its not going to make the throat survive erosion forever.
I chose 5R and chrome-lining... Denny's Operator barrel, but that's more than 1/2 the cost of this whole rifle
OP, you should check out Spike's offerings and keep an eye on the deals thread tacked up top. I just built a complete spike's 14.5" middy with all MOE gear for $740.