I'm sure I'm not the only one wanting to do this, but I never got any leads on what I wanted, even on the 6.5 grendel and CVA forums.
Not wanting to ever get sideways with the ATF in case the pistol brace rules change. I added a pinned and welded muzzle device. I couldn't find one the right diameter and length that I wanted but I finally found a longer one and cut it off.
Exactly what I wanted. 16 1/2" barrel that I can use as a pistol or a legal length carbine with a butt stock. Note: Those are mock holes on the extension. I didn't want the muzzle blast from a ported device. The overall length is 30.5"