Got in mail today. For anyone following my project, this is the Dinan muzzle brake I removed from the barrel combo I bought recently. Unscrewed easily by hand. Couldn't get photo of threaded barrel to post. Also won GunBroker auction for 1st Series MT, but on lay-a-way. Looks pristine but likely refinished. Comes with Elephant Ear stocks that also look beautiful but 2 slight cracks. If project is successful, you won't recognize finished MT when said and done anyway. Now just need to determine threading measurement particulars. Hopefully 1/2x28. Will see if AR15 flash suppressor attaches.