Ok. I know HDPS now sells UMP barrels that are already threaded. But what about the flanged barrel? Would it be remotely possible to thread the part in front of the flange? I don't want to buy another 16" barrel but would like to be able to shoot it when it comes back. My idea is to have Guy at title II arms make a 16x1 LH fake suppressor and have it pinned temporarily until the stamp comes back.