Ar-10 Barrel Extension Threads?

I have been threading AR-15 barrels for barrel extensions for a number of years.

I am going to try an AR-10 barrel now.

I have not been able to find any info on thread specs for the barrel extension from any manufacturer and or gap between bolt and barrel face etc.

I plan on using a dpms pattern extension in my armalite ar-10.

I learned that as long as you use a dpms pattern bolt you can use a dpms pattern barrel extension in an armalite.

I would use armalite but have not been able to...

Ar-10 Barrel Extension Threads?