Spoke with George at Gap today. He was enable to find the twist data in their computer log. He did confirm it should be 10 or 10.5
I measured with the patch method 3X (to ensure consistency, this method isn't as exact as id like but it's the only way without a build sheet that i know of)
10, 10 1/4, 10. So I think I can safely say the rifle is a 10 twist.