Find it here: https://doublemdefense.com/product/hbi-folding-brace-combo-for-stribog/

Factory New.

*** PLEASE NOTE: The current batch is made with the POLYMER HBI adapter. The function is the same; however, installation requires a rubber mallet applied with some force. ***

SKU: 10202-02

Comes With:
-HB Industries Folding Brace Adapter
-SB Tactical Brace

B&T APC9/MP5 type stock or arm brace adapter for your Grand Power Stribog SP9 A1/A2/A3. Our adapter is low profile and integrates the any B&T APC9/MP5 type stock or brace directly to the upper receiver of the Stribog. The assembly will maintain the side folding characteristics stock/brace. Our brace mount is machined from billet 6061T6 aluminum and hard coat anodized to MIL-A-8625, the SBT brace is polymer.

B&T APC9/MP5 Type Stock/Brace adapter for Grand Power Stribog A1/A2/A3
Side Folding with Seamless Integration into the SP9 Upper Receiver
Fits all Grand Power Stribog variants
Drop In, No Additional Parts or Hardware Needed
Machined Aluminum 6061-T6
Anodized MIL-A-8625 Type 3 Hard Coat
Designed and Manufactured completely in USA.

All NFA rules apply (if using this product on a pistol).

Gunsmith Installation Recommended for All Parts.