Do you know the thread for a Taipan Mutant barrel?

[BH]

Hi, Guys - 

I need to have a barrel threaded to fit the taipan mutant shroud (original mutant, not the veteran). Can anyone advise on the correct thread to request from my machinist?

thank you!

 

[scubajeeper]

Most everything is 1/2-20, so I'd think that's what it would be.