Tier One FTR ARCA Adapter - Extended Grey. You can use this page to purchase individual adapters for your FTR or Carbon FTR Bipod. They are interchangeable with the adapters on your FTR Bipod. Bipod is sold separately. If you're buying an Anschutz or Sling Stud adapter you will also need a 'Cant Block'. You don't need a Cant Block for the QD Picatinny or Arca Adapters though. Specifications for Tier One FTR Bipod Adapter: Manufacturer: Tier One Condition: New Fabric/Material: Aluminum Package Contents: Tier One FTR Bipod Adapter Nil Tier One T1ARCA-009: FTR ARCA Adapter - Extended Grey