The owner, Harrison Beane, is one of the most knowledgeable folks around when it comes to the 6.8 SPC. He helped in the design evolution from the original Remington 6.8 to the current SPC II and the 6.8 X 43 chambers. Many people refer to him as just "H", and the above mentioned site as ARP.
You will find him here, along with other good vendors for the 6.8 SPC, and more in-the-know folks in one place than anywhere else.
ARP put together an 18" stainless steel SPR profile barrel with Midwest Industries' SS freefloating handguards upper for me last year as a dedicated hunting rifle, and I couldn't be happier.