Empire feedneck threading is ICD threading .810 i believe.
Also, look at availability. Ccm feednecks suck. Huge, no lever and cor what they are, they are poorer to what is available. Empire, not only have them now, and you can get them just about everywhere.
The nub/stub/tit, whatever you can it, IS better. You can't crossthread it, it is stronger and i believe easier to machine.
Allen, Simon designed that feedneck & i am going to tell him that you don't like it. Expect your next ID purchase to have a gratuity added in on it
And if you don't like that feedneck, send it to me, i love them. Even better that it is clear/unanno'd. Seriously, i will take it.