Rugged Suppersor front cap tread size

[C Bow]

I bought a Rugged Alaskan 360 Ti and the rear tread is different from the front cap tread size. Does anyone know the front tread size Thanks

 

[Marcjr47]

I am wondering the same thing for a muzzle (anchor) brake.
I asked rugged via email and was told they are not offering a muzzle brake as of now and the front cap thread is considered proprietary.