Aluminum early adjustable stock? What is it?

[Diamondback]

I have the double star aluminum kit and it’s really nice.
As a bonus, it comes with the correct non castle spanner nut, which can be tough to find.
The only knock I have against it is the tube is black and not grey.
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Thanks for the headsup on that--two things, one they sound like a really helpful source for spares on C.'s C8 (and C7 if we build her one rather than just a "second URG for her lower") and two someone here, IIRC 26 Inf, had suggested a setscrew in the hole as an alternate to staking.

Now if only they made the new six-socket version...