Chris, the C stock is not a SC part and SC parts cost more than the same part with a R stamp. Maybe go with a Remington build to offset the scope and mount cost. They well shoot the same.
I can highly recommend the Kreiger barrels.
1903 barrels on this page, half way down. $$$
http://www.kriegerbarrels.com/AR_10D...#AR-10/DPMS-LR