Tier One FTR Bipod Cant Block Grey. The cant block is an integral part of the movement mechanism. Each FTR Bipod is shipped with one cant block. If you purchase additional sling stud anschutz or freeland adapters then you may wish to purchase an additional cant block. Not required for QD Picatinny or Arca adapters. Black version to match the Black FTR. Specifications for Tier One FTR Bipod Cant Block: Manufacturer: Tier One Fabric/Material: Aluminum Package Contents: Tier One FTR Bipod Cant Block Nil Tier One T1FTRCANTBLKG: FTR Bipod Cant Block Grey