USASOC has recently adopted the Geissele URGI (Improved Upper Reciever Group) Rifle. It's basically the same as the block 2, but instead of the Daniel Defense Ris II it has a 13" Geissele m-lok rail to save on weight and a new charging handle. I believe they make a 14.5 and 10.3 variant just like the block 2 and block 2 cqbr. It would be great to see these in the next update so we can keep up with the times.