I'm looking to SBR my M92 and I want to put a stock on it while I wait for the Paperwork, and a long muzzle device will fill the bill, I've looked a Fake suppresors and they look cheesy to me.

I kept searching and found  a XM177 type flash suppresor at US Machine gun and a thread adapter for the M92, I had a local shop TIG weld the Hider to the adapter.

You can pick up the extension on a number of places on the web like AK Builder or US Machinegun but to be legal it would have to be pinned and welded so it is permanently attached. Then when you get your stamp you can remove it. Honestly for what it would cost to do that you could set up a trust if you don't have one already and E-File your form 1. They are coming back approved in 30-35 days.