AR15 Barrel Extension Machining Dimensions

[chime]

Hi, I am planning of installing a barrel extension to my .223 1:9 blank barrel. My problem is I cannot find the exact dimensions needed for the items listed below:

1. Measurements for the installation of barrel extension and thread pitch.
2. The correct length/protrusion of the loaded ammo when inserted into the reamed chamber. (for correct headspace)
3. correct measurements of the barrel ramp (angle/length)

Thanks for the help guys.