Factory telescopic GHM9/45 brace assembly for a Gear Head Works Tailhook MOD1, sold without the Tailhook.

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The BT-20517 is B&T's telescopic brace adapter assembly for the GHM9 and GHM45. Its dual rails replace the host's rear assembly, and the rear adapter accepts a Gear Head Works Tailhook MOD1.
The product name matters: BT-20517 does not include the Tailhook. Budget for that second piece and confirm its availability before ordering the B&T assembly. The SPC9 uses different rear and buffer assemblies, so this GHM part is not a substitute for the SPC9 brace adapter listed in that platform's manual.
ATF does not make a categorical classification for every object marketed as a brace. The completed firearm and its objective configuration control, and state law may be more restrictive. Confirm the current rules that apply to the exact host before assembly.
Add the B&T GHM9/45 Telescopic Brace Adapter to your build and see how it enhances your platform.