I have a couple of 9mm AR15 SBR's. One is a Rock River Arms and the other is a Colt LE6933. Both have about 10" threaded barrels that I've been threading my TiRant 9 suppressor to. They work fine with this setup, but I always have to constantly check to verify that the suppressor isn't unthreading and the overall length is kind of long. I've recently purchased a B&T APC9 suppressor that's made to lock on using the tri-lug system.

I'd like to make or buy an upper that has a 5" or so long barrel with the tri-lug system. I'm thinking that the handguard would surround the suppressor almost completely when the suppressor is attached. This would minimize the overall length of the barrel + suppressor. Does anyone make an upper like this or the components for me to make one? Is there anything that I'm missing with this idea?