Factory three-position telescopic stock assembly for the GHM9 and GHM45, part BT-20506.

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The BT-20506 is B&T's complete telescopic stock assembly for the GHM9 and GHM45. It replaces the rear assembly with the factory two-rail unit and locks at three lengths, preserving the compact profile that distinguishes the GHM family from a buffer-tube conversion.
Fitment is narrow by design. B&T lists BT-20506 for the GHM9 and GHM45, while the SPC9 manual assigns different part numbers to that platform's rear assemblies. Do not order it for an SPC9 or APC9 because those guns use different stock and buffer hardware.
This is a shoulder stock. Install it only on a rifle or a lawfully configured short-barreled rifle, and confirm current federal, state, and local requirements before assembly.
Add the B&T GHM9/45 Telescopic Stock to your build and see how it enhances your platform.