My Max-11 lage upper has a 3 lug barrel, I'm building a stock m11/9 upper that uses the ilwt 8 3/8" barrel with an AR free float hand guard, It currently is 1/2 x 28 threads but I ordered the ilwt 3 lug adapter. My stock upper is 3/4 x 10 and my suppressor, silencerco hybrid, can't attach to it. Probably buy an ilwt 3 lug barrel for it when they're available.
My M10(still in jail) is only 7/8 x 9 threads. I may have a barrel threaded 5/8 x 24 and use my 30 cal direct thread mount but not sure, I'm thinking about a coastal mims 45 with mac adapters. That way I can shoot cast lead and 22 lr through it.
The Hybrid works great and I use it on almost every gun I own. The only dislike I have is it doesn't come apart so no lead through it.
Threaded kinda sucks on f/a. They get very hot very fast and are very difficult to unscrew. 3 lug is still a challenge to get off when hot. I always forget an oven mitt.