I recently ordered an Sig P320 and should be able to pick it up tomorrow https://www.sigsauer.com/swg .It is actually a P320978. I plan to get a threaded barrel for it and am curious of recommendations for suppressors. I want one I can disassemble myself to be able to clean. The only pistol suppressor I currently have is a SilencerCo Octane45K. Maybe the suppressor I have is good enough as I use it on two other Sigs, but I would like to have a dedicated 9mm version. The barrel I would order would have M13.5x1 LH thread pitch. I appreciate any input.

I'm pretty sure that a 9mm handgun offers about the maximum number of choices for a suppressor. It would be literally impossible IMO to provide a recommendation that is based solely on caliber. I have a bunch of these but which might be good options for you to investigate. What's important to you? size? weight? length? price? material? etc. etc. I get you want one you can disassemble. Maybe a few words on what you would like it to optimize?