You may want to call a good smith and have one built for you, like Shawn Carlock from Defensive Edge or George Garner from GAP. The Marines use the McMillan A4
stock right now, with custom Remington action and barrel, built up in house by Marines. So you may want to look into ordering a Mac A4 and have a Remington action built up into a rifle for you.
Check out snipershide.com for more info.