Thread Pitch for SEI Barrels?

[GWS]

I've been looking all over Smith Enterprise's site and cannot find the thread pitch for their barrels
Specifically their 18" Bush Rifle barreal and their 22" Crazy Horse barrels

I want to put a YHM Resonator on one of my M1A style rifles and want to use a QD attachment- at least at the start.
Thanks for any info

I guess I could call SEI in the AM but I want to know NOW!!

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[H2O MAN]

It should be .595-32, test fit a castle nut to confirm.

 

[GWS]

Thanks