I went with the B&T long mount and the LaRue LT661 QD base. I'm pretty sure that with a T2, you can't get low enough with the sight for an absolute co-witness. Even though the dot usually appears at the top of the front sight ring, I just can't bring myself to Dremel off the top of the ring.
The B&T short mount (BT-10266) won't work with the LaRue QD. You need the longer mount (BT-21241) because of the QD base length.
I like the ability to detach the T2 and reattach without loss of zero. LaRue's mounts are great for that. At LaRue, T2 with QD mount is $751, and I believe the LT661 QD base runs $107.
Here's the view through the sight:
Left and right close views of the mount:
Left and right views of the whole weapon with sight: