I spoke to Rainier today about the RUC MOD 2, looks like about another 3 months before it will be out. Also, one other interesting note; I was told that as of right now they are not making any changes to their rifles. This means no swapping out parts such a brakes,sights etc. I was both surprised and disappointed.
They are ready for shipping! I spoke to someone else at rainier and was told it would be no problem to swap out the brake. I am thinking of putting on an aac 51t brake.