Maybe a nice K can? Tirant M or the shorty CGS?
Unboosted ECCO?

Reliability would be the main concern, followed by blowback

Sound isn’t a concern

There's a member here that has posted pics of one several times. I can't remember which can they have but I think it was the Omega K. It's still a 320 so will they run without a booster?

Anyone else have general feedback from suppressing a 320?
Even: what threaded barrel did you choose?

@-kentuckywindage-
Saw your post in the picture thread

I am using a Dead Air Wolfman in the short configuration with booster.  I am using the factory Sig threaded barrel but I don’t like it as the barrel profile is too thin behind the threads.  My piston barely bottoms out on the shoulder of the barrel, I need to replace it with another manufacturer but have a hard time finding one that is cut for the LCI.  Reliably was rough the first 100 rounds or so with 6-8 storages then turning into single shot for a moment with 147 grain FMJs.  I am going to try another barrel with a new recoil spring assembly to see if it improves reliability.

Pic.
" />

I have with several silencers. Here is what you need to know:

Weight is not your friend here. 8oz-9oz is about max.
It does well with lighter cans like Tirant 9S / Mod X or Erector 9 with 4-6 baffles.
The SIG Mod X actually comes with a spare piston spring specifically to run with the P320. If you can find a lower power spring for your specific silencer that should help.
Hybrids and Omegas are a no go. Wolfman looks like with a piston and piston mount would be ~11oz.

It will never suppress as well as a 226/229 or Glock.
I use the OEM Compact/ Carry barrel in M13.5x1LH.
It's a common issue that comes up occasionally where shooters have cycling issues- it's something that can be worked through, but it can take some tweaking.

Great info guys
Still on the hunt for a USW, apparently harder to find than I expected

What color USW are you after?  FDE is in stock at B&T Parts

Black but I may not be picky…

FDE
https://bt-parts.com/bt-430211-us-ct-k-b-t-polymer-lower-for-usw-m17-coyote-tan/#description

Black, not sure if in stock but would call to confirm
https://bt-parts.com/bt-430174-k-b-t-usw-320-polymer-lower-for-sig-p320/

I have a suppressed XTen 10mm. Got a Huxwrx Rad 45 on it. It runs great. Very quiet with subsonics. Tolerable with hot rounds.