Modify Aluminum Cylinder Head for Marui Series Ver.3 (AK/ MP5K/ SIG)

Modify Aluminum Cylinder Head for Marui Series Ver.3 (AK/ MP5K/ SIG) Aluminum Construction With Double O-Ring & Pad Design For Replace the Original Parts Suitable For Tokyo Marui AK/ MP5K/ SIG (Version 3 Gearbox) Series Airsoft AEG Rifle Airsoft Guns