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Ruger Mark IV question

From the images and descriptions I've seen of the Mk IV, your Mk III upper will not work on the Mk IV. You'll notice that the upper of the new Mk IV hinges at the front of the frame; something the Mk III cannot do. There are other changes to the upper and the frame that preclude moving parts from older versions to the Mk IV. That is annoying, I know.

Richard