I know form1 cans are pretty much dead but this wouldn't actually be a suppressor.
I am looking for a metal tube that is threaded or can be threaded to attach a Tri-Lug Adapter to. There are various adapters with different threading so that is TBD.

It would essentially be the outer shell of a Suppressor without the Baffles so there wouldnt be any sound mitigation so therefore not a suppressor.
I built a 9mm PCC and I do have an Obsidian 45 that I can tuck under the handguard but the handguard is a bit (1.5")too Long and not sure it would be safe to shoot un-suppressed.
dont want to buy a NEW handguard or Dremel this one unless absolutely necessary.

Thanks for any valuable input.
Steve