I’ve looked into it quite a bit a little while ago. I decided, when I get one for my Saint Victor Pistol, I’m getting a .30 cal suppressor (I have a .300 BLK upper as well) and getting this thread converter for it. This should fit on the threads on the .556 and extend out enough to clear the handguard and install the .30 cal suppressor.
Thread Adapter OD 5/8×24 ID 1/2×28 Tools Required- 17mm Wrench Flats This will adapt your .223/5.56 barrel to a .30 cal standard thread pitch.
www.knsprecisioninc.com
I like the small handguard and really don’t want to change it. Hope this helps.