This adaptor is required if for the DAA Race Master/Racer Muzzle Support Assembly if you do not have, or, do not want to add a M8 hole in the bottom of your Race Master holster body.
The adaptor attached to your existing holster body without needing any fitting or modifications.
Note: This part will only fit the Right-Hand Race Master holsters only (NOT Left-Hand Race Master, or Racer holsters).