I think it will be a good stock. Haven't seen one in person but Magpul usually rocks. The price-point is good too. They have an option for mags and magwell. I think they will sell a ton of these. I would put my name down on one before they go "back-order" crazy. There are tons of great stock options for R700, but they get expensive fast! Ask me how I know? XLR Element is a great option too; they are in Grand Junction and colorado_hack is a dealer here on the board.
Take a look at these mounts, quality stuff and not super pricey. http://www.seekinsprecision.com/part...ope-bases.html
Be careful, there is no known cure for long range rifle sickness...