My version is the second described by saxman (front sight base extended further out on barrel and snake brake spot welded directly to sight base). Many thanks to all for the input.very valuable. Unless you are a pretty good wire welder, you'll have to find a welder/gunsmith to do the attaching, or maybe let the gunsmith do the whole job. This has been reported here several times, so it really happens. Even if it doesn't hit, firing sets up vibrations that can break the weld. This usually causes a slight angle break because of loose threads, and a severe case may cause the bullet to strike the brake. Many of the original extension-brakes were short-cut during assembly and were simply rotated to index but not tightened. The set-up must be wrench-tight before pinning/welding so there is no vibration when firing. This involves sanding the rear face of the attachment that contacts the sight base so it comes out right when tight. Some brakes need to be timed (clocked) to set the openings in the proper orientation when screwed on tight. When working on a change like this, you have two problems one, the existing set-up may be difficult to remove without damaging the barrel two, you have to do a mock-up and measure it with all threads tight before permanently attaching. 16" is the legal minimum, and most would want 16.25" just to be on the safe side. You measure barrel length by rodding the barrel against the closed bolt, marking the rod at the muzzle and measuring it. If you have the other barrel arrangement with just the original brake in front of the sight base, you'll have to measure that barrel length to see if you can go with a shorter brake, otherwise you'll need a 3" replacement. The original 'Snake' brake is 3" long, so your new brake on the 2" extension would have to be 2.25" long which I think will be easy to find in the style you want. Your overall length still has to be at least 4.25". Since the original two-piece brake/extension is longer than it has to be, you get some 'wiggle room' in deciding which brake to use on it. If you have the two-piece or Tapco, you'll need the 2" extension with a new brake on it.
So the first thing we need to know is what you have now. With the modified Romanian barrel, the sight base is moved farther from the gas block and only the original brake is required without the 2" extension. The AMD65s recently sold with original barrels and extension-brakes can have two versions a 2" pipe extension with the original brake or the one-piece Tapco unit. Neither one addresses the question, which asks about a slimmer attachment of the required length, which is 4.25" on an original barrel. That's nice piece of work, but carries additional weight over the Tapco unit.
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