Well, that didn't work out.
I knew the BT 10266 was only for "Aimpoint Micro and similar footprint" and I tried to confirm that the "standard mount" that came with the T-2 and Comp M5 were the same since they used the same mounts with no luck. I'd never seen the "standard mount" before since I always bought them without mounts.
Well, they must be different. The standard mount that came on the Comp M5 won't work with this tiny rail. Guess I'll have to use a T-2. I guess buying another Comp M5 is never a bad thing. I really prefer the Comp M5 but can get by with a T-2 for sure.
The BT mount install wasn't nearly as hard as I had read, it wasn't a tight fit at all. The little feet carry a much larger gap on the ejection port side which alarmed me at first but I confirmed all was level and I guess that's just the way it works. It is a very minimalist and non-obtrusive mount though, which is what I wanted.
Off to find a T-2 with "standard mount" in stock somewhere.......