Cyclops accessory barrels are currently comes in .44 Magnum and 45-70 Gov't, with more calibers on the way. These barrels come in two finish options Satin or Rough series to perfectly complement your existing Cyclops frame. Changing the barrels is incredibly simple, requiring only the removal and replacement of a single hinge pin. Please note that Cyclops accessory barrels are exclusive to the Cyclops frame and are not compatible with other Bond Arms models, including the original Hand Cannon, Stinger or Stinger RS.