My Heathen brake body measures .900" the knurled lock ring is 1.040" Looks and works great on a .750" RPR barrel
I'd get the size smaller, it's .9 something, can't remember off hand without looking, I have one on a .750 barrel now but will be on a .850 soon.
how much of a difference is there really? between .996 or 1.096?