Nope it was a gas operated one for sure, not sure if it was here or another site though. The only 762x25 build I can find so far is PBB's build on a amd http://www.gunco.net/forums/f3/amd-b...7-62x25-27382/ He says he got it to shoot and wanted to make changes, but never posted again. There may be more info on the thompson machine site.
....and there was a little bit more info. ThompsonMachine.net