Just some factory options from Boyds I believe, you could check stockys online, they have a pretty good selection. If you google savage mkII AICS airsoft, you'll see a bunch of pictures of folks who have modded an airsoft stock to work, I've done the same to my 17 WSM, there is a short youtube video on it.
Just watched your video Cody, that turned really cool. I especially like the look of your barrel. Looks alot better than the skinny little noodle barrels. Very nice job.