I literally just got my 3rd set of these in today.
So here's some pics:
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The above photo shows how the handguard interface is apart of the upper. All forged as one piece. The pic below shows the barrel nut. The teeth protrude outwards towards the muzzle end, and they don't interfere with the gas tube.
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The two pieces fit together nicely and are secured in place with 8 screws.
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The rail blends well with the pic rail of the upper, and extends a little bit on each side of the upper for support against rotation.
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I like designs like these for their added strength and features. Seekins, Larue, and many other companies have uppers similar to this. (But they usually cost a lot more $$$) Short of a monolithic, I think designs like these are the way to go.