^ ^ exactly FD.
The back mount is about 1/4 to 1/2 inch higher up. due to the barrell change in size.
The mounts are both roughly the same size at the top. Which means ones a squatty A and ones a tall A. The talls in the front.
The 'shroud' looks like it acts as a rail for the scope mount. Theres a screw that stops the 'shroud' from being on top of the rail. Theres not room. Which means it IS the rail.
The rail, has enough room for the scope bracket to pinch under it, But its not raised up on a giant block like in the diagrams.
Now, regardless, two things catch my eye on arts picture.
Theres a diaganol line, and no horizontal line, leaving the top of the molex. Heading towards the top of the mount. And at the bottom of the molex, you see another angled piec cutting in towards the clamp.