I'm attempting to suppress a CZ-85B, and know a guy who has done a CZ-75 before.  He tells me that because the barrel is only 1/2 inch thick, the CZ requires a suppressor that indexes/tightens at the muzzle of the barrel, as opposed to the shoulder behind the threads, as most do.  He has an AAC EVO-9 which has a step that leads to the threads which serves this purpose.

Does anyone know if any other suppressor features this?  I also read somewhere that metric 13.5 x 1 mm threads natively tighten suppressors at the muzzle as opposed to the shoulder.  Can anyone confirm this?

I believe the trinity LID I have for my my walther P99 indexes on the barrel face, rather than the shoulder, but I am not 100% sure.  I'm sure someone will chime in shortly.

Quoted: I would instead have someone thread the barrel 3/8x24 and put an adaptor on it to 1/2x28. that will save you from needing a custom can for it.

He only needs the custom piston
It would be possible to have a piston that could index both ways