His reply:I don't know. I didn't notice that. I had a good email conversation with the owner, prior to ordering mine. I just emailed him your question. I'll let you know what he says.
Sorry for taking so long to get to your email.
I guess someone was eventually going to ask the right question...haha. So what they're seeing is basically the patent pending construction of the handguard, and the reason why it's lighter than anything else out right now. It's commonly referred to as sandwich panel construction. I'm an aerospace engineer with composites experience so I've seen it a good bit.
These guys did a pretty good brief description of what it is:
Buy Composite Sandwich Panels | Rock West Composites
This is a little more in depth explanation and really well written:
Why You Should Be Using Sandwich Panels aircraft interiors and Formula 1 cars are so stiff and light
They only say aircraft interiors in the second article but it's also used on structural parts that will take bird strikes.
Anyone who's worked in composites will probably appreciate the difficulty and expense in making a tubular shaped sandwich laminate. The fact that it's used on formula one cars should say a lot. They're definitely on the cutting edge of composites technology.
I hope that answers your question.