This kit includes the Reaper nozzle and the cage it is housed in. The black one comes standard with your Reaper.

Standard Cage: For barrel setups 300mm+ in length. Includes a 60 Ratio Cage and nozzle assembly. (Please specify nozzle type when ordering)

SBR Cage: The purple one improves efficiency for short barrel rifles that are less than 300mm long and includes a 70 Ratio Cage and nozzle assembly. (Please specify nozzle type when ordering)