We don't make an adapter specifically for the Bin Tac T9 because we've seen several variants from different dealers, and it's a bit like trying to hit 4 moving targets all at once. I've heard our A91 works on some of them. I've also heard it doesn't.
The A91 has M18x1 threads, and in general .357 moderators work best with that thread size.
We discourage customers from using our products on airguns that they weren't designed for. The T9 is a powerful airgun, and we can't be responsible for any use of our products outside of their design specifications.