HBPDW Replacement Castle Nut Wrench for SB HBPDW Brace comes with the SB Tactical Honey Badger Brace for AR-15.  Used to install/remove the castle nut that retains the HBPDW housing. This OEM quality wrench is included with both the HBPDW 556/300BLK and HBPDW 9mm.

Installation

Thread the castle nut onto the HBPDW buffer tube and hand-tighten. Ensure the brace assembly is level and tighten the castle nut with the HBPDW Wrench. The shaft of a flat head screwdriver, box wrench, etc. will also be useful in the slots to turn the wrench.
Full installation instructions available through SB Tactical.