Whoa! .925?! Are you sure? I mean, I know you are, but that is huge! I don't know anyone who is making a drop in that large. Larue makes them for up to about .875, and that is the largest I know of off the top of my head.
On bull barrel AR's we generally have to turn down the area for the gas block and then flute a groove for the gas tube, or go with the less conventional bent tube configuration.
Good luck and let me know how the search goes. That is definitely a BULL barrel you got there....