Silverback TAC 41 Airsoft Aluminium Cylinder Head

Silverback TAC 41 Airsoft Aluminium Cylinder Head Aluminum Construction Airsoft Cylinder Head 4.60 internal Diameter Nozzle With Oring Suitable For Silverback TAC41 Series Airsoft Sniper Rifle Compatible with (must be used with a ?GBB? hopup unit- SBA-HOP-31): Original TAC-41 piston (SBA-BPS-30) Variable mass piston for TAC-41 (SBA-BPS-31) Advanced piston head ?GBB? (SBA-BPH-02) (Not Compatible With SBA-BPS-15 AND SBA-BPH-01, SBA-CYL-33)