I've looked at the Ergo ones. No way they would work and sounds like the Magpuls won't either. That's fine, I can use it as is with little issue. If need be I can wear some gloves if it becomes a problem. I don't have a happy switch and I don't do mag dumps so it shouldn't be too bad.
Forearm = Troy 7.2" MLOK
Barrel = ADCO 4.5" 9mm
Suppressor = SiCo Octane 9mm
ETA...
the ID of the Troy is 1.58"
The OD of the Octane is 1.37"
So obviously, I don't have a lot of room to play with