WCI 6.5 Grendel brake from AA. 3/4-28 Threading. There is a wear spot on the edge in the front. I tried to get a picture of it, but the camera and I were having trouble cooperating. I can touch it up with a birchwood casey pen, or leave it as is.
This brake works very well, but I bought a TBAC 30p-1 and i had to get the barrel re-threaded.
Actual Item photo